Knowledge

Peter–Weyl theorem

Source 📝

22: 2891: 393:
characterization. In fact, the matrix coefficients form a unital algebra invariant under complex conjugation because the product of two matrix coefficients is a matrix coefficient of the tensor product representation, and the complex conjugate is a matrix coefficient of the dual representation.
2713: 1939: 997:
decomposes into an orthogonal direct sum of all the irreducible unitary representations, in which the multiplicity of each irreducible representation is equal to its degree (that is, the dimension of the underlying space of the representation). Thus,
1094: 1614: 2886:{\displaystyle \operatorname {SU} (2)=\left\{{\begin{pmatrix}\alpha &-{\overline {\beta }}\\\beta &{\overline {\alpha }}\end{pmatrix}}:\ \ \alpha ,\beta \in \mathbb {C} ,\,|\alpha |^{2}+|\beta |^{2}=1\right\}~,} 652: 3274: 1798: 3339: 2392: 2295: 445:
into finite-dimensional representations. Now, intuitively groups were conceived as rotations on geometric objects, so it is only natural to study representations which essentially arise from continuous
3419: 2530: 3510: 2604: 1451: 2965: 1698: 1367: 1275: 1821: 896: 339:) as an open subset. Matrix coefficients are continuous, since representations are by definition continuous, and linear functionals on finite-dimensional spaces are also continuous. 294: 1004: 1524: 2076: 1216: 3421:
consisting of matrix coefficients amounts to finding an orthonormal basis consisting of hyperspherical harmonics, which is a standard construction in analysis on spheres.
2650: 2206: 1655:
as follows. Suppose that a representative π is chosen for each isomorphism class of irreducible unitary representation, and denote the collection of all such π by Σ. Let
1981: 1516: 1328: 1177: 2693: 2156: 1653: 1490: 1302: 1151: 995: 943: 817: 764: 255: 3120: 2459: 3140: 3194: 3167: 3080: 2921: 2226: 2176: 203:) decomposes as the direct sum of all irreducible unitary representations. Moreover, the matrix coefficients of the irreducible unitary representations form an 3530: 3100: 3053: 3029: 3009: 2985: 2116: 2096: 2008: 1236: 2695:
in terms of matrix coefficients as a generalization of the theory of Fourier series. Indeed, this decomposition is often referred to as a Fourier series.
366: 456:, this approach is similar except that the circle group is (ultimately) generalised to the group of unitary operators on a given Hilbert space.) 452:
on Hilbert spaces. (For those who were first introduced to dual groups consisting of characters which are the continuous homomorphisms into the
583: 3202: 1706: 3282: 2306: 3938: 2234: 394:
Hence the theorem follows directly from the Stone–Weierstrass theorem if the matrix coefficients separate points, which is obvious if
3439: 2417: 3347: 3933: 3923: 3472:: Every compact Lie group has a faithful finite-dimensional representation and is therefore isomorphic to a closed subgroup of 3669:
Peter, F.; Weyl, H. (1927), "Die Vollständigkeit der primitiven Darstellungen einer geschlossenen kontinuierlichen Gruppe",
2467: 3475: 2541: 1375: 3718: 2926: 3943: 3780: 3758: 3699: 2609:
The last part of the Peter–Weyl theorem then asserts in this case that these functions form an orthonormal basis for
2158:, and therefore a Hilbert space in its own right. Within the space of matrix coefficients for a fixed representation 1934:{\displaystyle \left\{{\sqrt {d^{(\pi )}}}u_{ij}^{(\pi )}\mid \,\pi \in \Sigma ,\,\,1\leq i,j\leq d^{(\pi )}\right\}} 65: 43: 1658: 1333: 1241: 389:
in that it indicates the density of a set of functions in the space of all continuous functions, subject only to an
36: 3828: 829: 3738: 2704: 705: 386: 1089:{\displaystyle L^{2}(G)={\underset {\pi \in \Sigma }{\widehat {\bigoplus }}}E_{\pi }^{\oplus \dim E_{\pi }}} 124:). The theorem is a collection of results generalizing the significant facts about the decomposition of the 3032: 1179:, with the two factors acting by translation on the left and the right, respectively. Fix a representation 1609:{\displaystyle L^{2}(G)={\underset {\pi \in \Sigma }{\widehat {\bigoplus }}}E_{\pi }\otimes E_{\pi }^{*}.} 267: 3928: 3733: 3728: 219:
is the group of unit complex numbers, this last result is simply a standard result from Fourier series.
147:
be a compact group. The theorem has three parts. The first part states that the matrix coefficients of
3569: 820: 726: 448: 180: 148: 3442:
of the irreducible representations of a connected compact Lie group. The argument also depends on the
2021: 3454: 1182: 133: 3443: 503: 30: 2612: 2184: 3608: 3593: 2988: 2179: 164: 3447: 1947: 1495: 1307: 1156: 780: 438: 184: 125: 47: 2662: 2125: 1622: 1459: 1280: 1120: 964: 912: 786: 733: 674:). Notice how this generalises the special case of the one-dimensional Hilbert space, where U( 240: 3795: 3105: 2967:. The irreducible representations of SU(2), meanwhile, are labeled by a non-negative integer 2431: 3125: 3172: 3145: 3058: 2899: 2652:. In this case, the theorem is simply a standard result from the theory of Fourier series. 1099:
where Σ denotes the set of (isomorphism classes of) irreducible unitary representations of
312: 3434:
The Peter–Weyl theorem—specifically the assertion that the characters form an orthonormal
2211: 2161: 8: 3541:
From the Peter–Weyl theorem, one can deduce a significant general structure theorem. Let
2428:
A simple but helpful example is the case of the group of complex numbers of magnitude 1,
1815:
be the degree of the representation π. The theorem now asserts that the set of functions
549: 308: 721:
To state the third and final part of the theorem, there is a natural Hilbert space over
3845: 3812: 3656: 3515: 3085: 3038: 3014: 2994: 2970: 2101: 2081: 1993: 1221: 1104: 534:. Conversely, given such a map, we can uniquely recover the action in the obvious way. 229: 3776: 3754: 3714: 3695: 2300:
In the notation above, the character is the sum of the diagonal matrix coefficients:
950: 906: 324: 204: 114: 94: 90: 3837: 3826:; Stewart, T. E. (1961), "The cohomology of differentiable transformation groups", 3804: 3768: 3746: 3678: 569: 3644: 3612: 3546: 3142:. The key to verifying this claim is to compute that for any two complex numbers 2461:. In this case, the irreducible representations are one-dimensional and given by 1238:. The space of matrix coefficients for the representation may be identified with 681:
Given these definitions, we can state the second part of the Peter–Weyl theorem (
2535:
There is then a single matrix coefficient for each representation, the function
3823: 406:, p. 17). Conversely, it is a consequence of the theorem that any compact 3597: 3917: 3790: 3775:, Progress in Mathematics, vol. 140 (2nd ed.), Boston: Birkhäuser, 102: 98: 2122:. The space of square-integrable class functions forms a closed subspace of 3438:
for the space of square-integrable class functions—plays a key role in the
2408:
form a Hilbert basis for the space of square-integrable class functions on
768: 453: 437:
The second part of the theorem gives the existence of a decomposition of a
399: 378: 328: 129: 106: 3713:, Graduate Texts in Mathematics, vol. 222 (2nd ed.), Springer, 3711:
Lie Groups, Lie Algebras, and Representations: An Elementary Introduction
137: 110: 82: 3429: 1700:
be the matrix coefficients of π in an orthonormal basis, in other words
3849: 3816: 3682: 647:{\displaystyle \langle \rho (g)v,\rho (g)w\rangle =\langle v,w\rangle } 3643:. It may of course not itself be a Lie group: it may for example be a 3465:
One important consequence of the Peter–Weyl theorem is the following:
3269:{\displaystyle (\alpha ,\beta )\mapsto (z_{1}\alpha +z_{2}\beta )^{m}} 1793:{\displaystyle u_{ij}^{(\pi )}(g)=\langle \pi (g)e_{j},e_{i}\rangle .} 3585: 3334:{\displaystyle (\alpha ,\beta )\in \mathbb {C} ^{2}=\mathbb {R} ^{4}} 2387:{\displaystyle \chi _{\pi }=\sum _{i=1}^{d^{(\pi )}}u_{ii}^{(\pi )}.} 407: 362: 3841: 3808: 2416:
This result plays an important part in Weyl's classification of the
2987:
and can be realized as the natural action of SU(2) on the space of
2397:
An important consequence of the preceding result is the following:
730: 191:. The third part then asserts that the regular representation of 2290:{\displaystyle \chi _{\pi }(g)=\operatorname {trace} (\pi (g)).} 716: 78:
Basic result in harmonic analysis on compact topological groups
3793:(1961), "Cohomology of topological groups and solvmanifolds", 417:
A corollary of this result is that the matrix coefficients of
708:
of irreducible finite-dimensional unitary representations of
432: 3536: 3414:{\displaystyle L^{2}(\operatorname {SU} (2))=L^{2}(S^{3})} 3011:
in two complex variables. The matrix coefficients of the
1330:
on the matrix coefficients corresponds to the action on
183:. The second part asserts the complete reducibility of 2404:: The characters of the irreducible representations of 945:. Roughly it asserts that the matrix coefficients for 2745: 1662: 3518: 3478: 3430:
Representation theory of connected compact Lie groups
3350: 3285: 3205: 3175: 3148: 3128: 3108: 3088: 3061: 3041: 3017: 2997: 2973: 2929: 2902: 2716: 2665: 2615: 2544: 2525:{\displaystyle \pi _{n}(e^{i\theta })=e^{in\theta }.} 2470: 2434: 2309: 2237: 2214: 2187: 2164: 2128: 2104: 2084: 2024: 1996: 1950: 1824: 1709: 1661: 1625: 1527: 1498: 1462: 1378: 1336: 1310: 1283: 1244: 1224: 1185: 1159: 1123: 1007: 967: 915: 832: 789: 736: 692:
Let ρ be a unitary representation of a compact group
586: 270: 243: 3505:{\displaystyle \operatorname {GL} (n;\mathbb {C} )} 3836:(4), The Johns Hopkins University Press: 623–644, 3524: 3504: 3460: 3413: 3333: 3268: 3188: 3161: 3134: 3114: 3094: 3074: 3047: 3023: 3003: 2979: 2959: 2915: 2885: 2687: 2644: 2599:{\displaystyle u_{n}(e^{i\theta })=e^{in\theta }.} 2598: 2524: 2453: 2386: 2289: 2220: 2200: 2170: 2150: 2110: 2090: 2070: 2002: 1975: 1933: 1792: 1692: 1647: 1608: 1510: 1484: 1446:{\displaystyle (g,h)\cdot A=\pi (g)A\pi (h)^{-1}.} 1445: 1361: 1322: 1296: 1269: 1230: 1210: 1171: 1145: 1088: 989: 937: 890: 811: 758: 646: 342:The first part of the Peter–Weyl theorem asserts ( 288: 249: 2960:{\displaystyle \mathbb {C} ^{2}=\mathbb {R} ^{4}} 1985: 3915: 3545:be a compact topological group, which we assume 2703:We use the standard representation of the group 2418:representations of a connected compact Lie group 1304:to itself. The natural left and right action of 1153:as a representation of the direct product group 3344:In this case, finding an orthonormal basis for 901:The final statement of the Peter–Weyl theorem ( 3082:of homogeneous harmonic polynomials of degree 1693:{\displaystyle \scriptstyle {u_{ij}^{(\pi )}}} 1619:Finally, we may form an orthonormal basis for 1362:{\displaystyle \operatorname {End} (E_{\pi })} 1270:{\displaystyle \operatorname {End} (E_{\pi })} 3822: 1784: 1746: 717:Decomposition of square-integrable functions 641: 629: 623: 587: 552:, ρ, which arise from continuous actions of 2896:Thus, SU(2) is represented as the 3-sphere 3751:Representation theory of semisimple groups 522:. This map is clearly a homomorphism from 3668: 3495: 3321: 3306: 2947: 2932: 2822: 2815: 1891: 1890: 1877: 433:Decomposition of a unitary representation 121: 66:Learn how and when to remove this message 3803:(1), Princeton University Press: 20–48, 3453:An outline of the argument may be found 891:{\displaystyle \rho (h)f(g)=f(h^{-1}g).} 29:This article includes a list of general 3537:Structure of compact topological groups 3916: 3789: 3572:on the left, we consider the image of 1107:of the direct sum of the total spaces 222: 3905: 3767: 3745: 2659:, we can regard the decomposition of 902: 682: 411: 403: 347: 3893: 3881: 3869: 3708: 3689: 2698: 560:. We say that a representation ρ is 470:A continuous linear action ∗ : 343: 289:{\displaystyle \varphi =L\circ \pi } 15: 2423: 1554: 1034: 530:), the bounded linear operators on 89:is a basic result in the theory of 13: 3584:is compact, and a subgroup of the 1884: 1569: 1049: 905:, Theorem 1.12) gives an explicit 666:. (I.e. it is unitary if ρ : 482:, gives rise to a continuous map ρ 357:The set of matrix coefficients of 35:it lacks sufficient corresponding 14: 3955: 3939:Theorems in representation theory 3773:Lie Groups Beyond an Introduction 410:is isomorphic to a matrix group ( 2071:{\displaystyle f(hgh^{-1})=f(g)} 1103:, and the summation denotes the 949:, suitably renormalized, are an 385:This first result resembles the 335:(e.g. trace), which contains GL( 20: 3829:American Journal of Mathematics 3461:Linearity of compact Lie groups 3424: 3055:, that is, the restrictions to 1211:{\displaystyle (\pi ,E_{\pi })} 767:; this makes sense because the 3899: 3887: 3875: 3863: 3753:, Princeton University Press, 3499: 3485: 3446:(for class functions) and the 3408: 3395: 3379: 3376: 3370: 3361: 3298: 3286: 3257: 3224: 3221: 3218: 3206: 2856: 2847: 2833: 2824: 2729: 2723: 2682: 2676: 2639: 2626: 2571: 2555: 2497: 2481: 2376: 2370: 2350: 2344: 2281: 2278: 2272: 2266: 2254: 2248: 2145: 2139: 2065: 2059: 2050: 2028: 1986:Restriction to class functions 1967: 1961: 1921: 1915: 1869: 1863: 1843: 1837: 1758: 1752: 1740: 1734: 1729: 1723: 1683: 1677: 1642: 1636: 1544: 1538: 1479: 1473: 1428: 1421: 1412: 1406: 1391: 1379: 1356: 1343: 1277:, the space of linear maps of 1264: 1251: 1205: 1186: 1140: 1134: 1024: 1018: 984: 978: 932: 926: 882: 863: 854: 848: 842: 836: 806: 800: 753: 747: 617: 611: 599: 593: 113:, in the setting of a compact 1: 3934:Theorems in harmonic analysis 3924:Unitary representation theory 3662: 3549:. For any finite-dimensional 3279:is harmonic as a function of 1492:as unitary representation of 690:Peter–Weyl Theorem (Part II). 678:) is just the circle group.) 237:is a complex-valued function 171:, and thus also in the space 105:. It was initially proved by 2780: 2761: 2645:{\displaystyle L^{2}(S^{1})} 2201:{\displaystyle \chi _{\pi }} 367:continuous complex functions 355:Peter–Weyl Theorem (Part I). 7: 3734:Encyclopedia of Mathematics 3650: 3641:inverse limit of Lie groups 1944:is an orthonormal basis of 727:square-integrable functions 696:on a complex Hilbert space 463:be a topological group and 307:) is a finite-dimensional ( 181:square-integrable functions 149:irreducible representations 10: 3960: 1114:of the representations π. 704:splits into an orthogonal 101:, but are not necessarily 1976:{\displaystyle L^{2}(G).} 1511:{\displaystyle G\times G} 1323:{\displaystyle G\times G} 1172:{\displaystyle G\times G} 467:a complex Hilbert space. 387:Stone–Weierstrass theorem 261:given as the composition 134:Ferdinand Georg Frobenius 3944:Theorems in group theory 3619:, we get a result about 3033:hyperspherical harmonics 2688:{\displaystyle L^{2}(G)} 2151:{\displaystyle L^{2}(G)} 1648:{\displaystyle L^{2}(G)} 1485:{\displaystyle L^{2}(G)} 1297:{\displaystyle E_{\pi }} 1146:{\displaystyle L^{2}(G)} 990:{\displaystyle L^{2}(G)} 938:{\displaystyle L^{2}(G)} 812:{\displaystyle L^{2}(G)} 759:{\displaystyle L^{2}(G)} 250:{\displaystyle \varphi } 165:complex-valued functions 3709:Hall, Brian C. (2015), 3615:) over all such spaces 3580:). It is closed, since 3115:{\displaystyle \alpha } 2989:homogeneous polynomials 2454:{\displaystyle G=S^{1}} 327:on the vector space of 185:unitary representations 155:are dense in the space 50:more precise citations. 3526: 3506: 3448:Weyl character formula 3415: 3335: 3270: 3190: 3163: 3136: 3135:{\displaystyle \beta } 3116: 3096: 3076: 3049: 3031:th representation are 3025: 3005: 2981: 2961: 2917: 2887: 2689: 2655:For any compact group 2646: 2600: 2526: 2455: 2388: 2356: 2291: 2222: 2202: 2172: 2152: 2112: 2092: 2072: 2004: 1977: 1935: 1794: 1694: 1649: 1610: 1512: 1486: 1456:Then we may decompose 1447: 1363: 1324: 1298: 1271: 1232: 1212: 1173: 1147: 1090: 991: 939: 892: 813: 781:unitary representation 760: 714: 648: 439:unitary representation 383: 290: 251: 126:regular representation 3796:Annals of Mathematics 3690:Bump, Daniel (2004), 3604:is a Lie group also. 3527: 3507: 3444:Weyl integral formula 3416: 3336: 3271: 3191: 3189:{\displaystyle z_{2}} 3164: 3162:{\displaystyle z_{1}} 3137: 3117: 3097: 3077: 3075:{\displaystyle S^{3}} 3050: 3026: 3006: 2982: 2962: 2918: 2916:{\displaystyle S^{3}} 2888: 2690: 2647: 2601: 2527: 2456: 2389: 2323: 2292: 2223: 2203: 2173: 2153: 2113: 2093: 2073: 2005: 1978: 1936: 1795: 1695: 1650: 1611: 1513: 1487: 1448: 1364: 1325: 1299: 1272: 1233: 1213: 1174: 1148: 1091: 992: 940: 893: 814: 761: 687: 649: 352: 291: 252: 122:Peter & Weyl 1927 3729:"Peter-Weyl theorem" 3553:-invariant subspace 3516: 3476: 3348: 3283: 3203: 3173: 3146: 3126: 3106: 3086: 3059: 3039: 3015: 2995: 2971: 2927: 2900: 2714: 2663: 2613: 2542: 2468: 2432: 2307: 2235: 2221:{\displaystyle \pi } 2212: 2185: 2171:{\displaystyle \pi } 2162: 2126: 2102: 2082: 2022: 1994: 1948: 1822: 1707: 1659: 1623: 1525: 1496: 1460: 1376: 1334: 1308: 1281: 1242: 1222: 1183: 1157: 1121: 1005: 965: 913: 830: 787: 734: 584: 377:, equipped with the 313:group representation 299:where π :  268: 241: 215:). In the case that 3908:, Corollary IV.4.22 3627:acts faithfully on 3607:If we now take the 3592:). It follows by a 2380: 1873: 1733: 1687: 1602: 1117:We may also regard 1085: 961:). In particular, 550:group homomorphisms 543:on a Hilbert space 539:representations of 537:Thus we define the 223:Matrix coefficients 132:, as discovered by 109:, with his student 3929:Topological groups 3824:Palais, Richard S. 3683:10.1007/BF01447892 3657:Pontryagin duality 3600:that the image of 3522: 3502: 3411: 3331: 3266: 3186: 3159: 3132: 3112: 3092: 3072: 3045: 3021: 3001: 2977: 2957: 2913: 2883: 2787: 2685: 2642: 2596: 2522: 2451: 2384: 2357: 2287: 2218: 2198: 2168: 2148: 2108: 2088: 2068: 2000: 1973: 1931: 1850: 1790: 1710: 1690: 1689: 1664: 1645: 1606: 1588: 1573: 1508: 1482: 1443: 1359: 1320: 1294: 1267: 1228: 1208: 1169: 1143: 1086: 1055: 1053: 987: 935: 888: 809: 756: 644: 286: 247: 230:matrix coefficient 95:topological groups 87:Peter–Weyl theorem 3791:Mostow, George D. 3769:Knapp, Anthony W. 3611:(in the sense of 3525:{\displaystyle n} 3095:{\displaystyle m} 3048:{\displaystyle m} 3024:{\displaystyle m} 3004:{\displaystyle m} 2980:{\displaystyle m} 2879: 2801: 2798: 2783: 2764: 2699:An example: SU(2) 2111:{\displaystyle h} 2091:{\displaystyle g} 2003:{\displaystyle f} 1848: 1560: 1551: 1231:{\displaystyle G} 1040: 1031: 951:orthonormal basis 907:orthonormal basis 823:on the left, via 685:, Theorem 1.12): 414:, Theorem 1.15). 350:, Theorem 1.12): 325:linear functional 205:orthonormal basis 115:topological group 91:harmonic analysis 76: 75: 68: 3951: 3909: 3903: 3897: 3891: 3885: 3879: 3873: 3867: 3852: 3819: 3785: 3763: 3742: 3723: 3704: 3685: 3531: 3529: 3528: 3523: 3511: 3509: 3508: 3503: 3498: 3420: 3418: 3417: 3412: 3407: 3406: 3394: 3393: 3360: 3359: 3340: 3338: 3337: 3332: 3330: 3329: 3324: 3315: 3314: 3309: 3275: 3273: 3272: 3267: 3265: 3264: 3252: 3251: 3236: 3235: 3196:, the function 3195: 3193: 3192: 3187: 3185: 3184: 3168: 3166: 3165: 3160: 3158: 3157: 3141: 3139: 3138: 3133: 3121: 3119: 3118: 3113: 3101: 3099: 3098: 3093: 3081: 3079: 3078: 3073: 3071: 3070: 3054: 3052: 3051: 3046: 3030: 3028: 3027: 3022: 3010: 3008: 3007: 3002: 2986: 2984: 2983: 2978: 2966: 2964: 2963: 2958: 2956: 2955: 2950: 2941: 2940: 2935: 2922: 2920: 2919: 2914: 2912: 2911: 2892: 2890: 2889: 2884: 2877: 2876: 2872: 2865: 2864: 2859: 2850: 2842: 2841: 2836: 2827: 2818: 2799: 2796: 2792: 2791: 2784: 2776: 2765: 2757: 2694: 2692: 2691: 2686: 2675: 2674: 2651: 2649: 2648: 2643: 2638: 2637: 2625: 2624: 2605: 2603: 2602: 2597: 2592: 2591: 2570: 2569: 2554: 2553: 2531: 2529: 2528: 2523: 2518: 2517: 2496: 2495: 2480: 2479: 2460: 2458: 2457: 2452: 2450: 2449: 2424:An example: U(1) 2393: 2391: 2390: 2385: 2379: 2368: 2355: 2354: 2353: 2337: 2319: 2318: 2296: 2294: 2293: 2288: 2247: 2246: 2227: 2225: 2224: 2219: 2207: 2205: 2204: 2199: 2197: 2196: 2177: 2175: 2174: 2169: 2157: 2155: 2154: 2149: 2138: 2137: 2117: 2115: 2114: 2109: 2097: 2095: 2094: 2089: 2077: 2075: 2074: 2069: 2049: 2048: 2009: 2007: 2006: 2001: 1982: 1980: 1979: 1974: 1960: 1959: 1940: 1938: 1937: 1932: 1930: 1926: 1925: 1924: 1872: 1861: 1849: 1847: 1846: 1831: 1811:. Finally, let 1799: 1797: 1796: 1791: 1783: 1782: 1770: 1769: 1732: 1721: 1699: 1697: 1696: 1691: 1688: 1686: 1675: 1654: 1652: 1651: 1646: 1635: 1634: 1615: 1613: 1612: 1607: 1601: 1596: 1584: 1583: 1574: 1572: 1561: 1553: 1537: 1536: 1517: 1515: 1514: 1509: 1491: 1489: 1488: 1483: 1472: 1471: 1452: 1450: 1449: 1444: 1439: 1438: 1368: 1366: 1365: 1360: 1355: 1354: 1329: 1327: 1326: 1321: 1303: 1301: 1300: 1295: 1293: 1292: 1276: 1274: 1273: 1268: 1263: 1262: 1237: 1235: 1234: 1229: 1217: 1215: 1214: 1209: 1204: 1203: 1178: 1176: 1175: 1170: 1152: 1150: 1149: 1144: 1133: 1132: 1095: 1093: 1092: 1087: 1084: 1083: 1082: 1063: 1054: 1052: 1041: 1033: 1017: 1016: 996: 994: 993: 988: 977: 976: 944: 942: 941: 936: 925: 924: 897: 895: 894: 889: 878: 877: 818: 816: 815: 810: 799: 798: 765: 763: 762: 757: 746: 745: 653: 651: 650: 645: 570:unitary operator 494:(functions from 365:in the space of 303: → GL( 295: 293: 292: 287: 256: 254: 253: 248: 163:) of continuous 71: 64: 60: 57: 51: 46:this article by 37:inline citations 24: 23: 16: 3959: 3958: 3954: 3953: 3952: 3950: 3949: 3948: 3914: 3913: 3912: 3904: 3900: 3892: 3888: 3880: 3876: 3868: 3864: 3842:10.2307/2372901 3809:10.2307/1970281 3783: 3761: 3727: 3721: 3702: 3665: 3653: 3645:profinite group 3613:category theory 3539: 3517: 3514: 3513: 3494: 3477: 3474: 3473: 3463: 3432: 3427: 3402: 3398: 3389: 3385: 3355: 3351: 3349: 3346: 3345: 3325: 3320: 3319: 3310: 3305: 3304: 3284: 3281: 3280: 3260: 3256: 3247: 3243: 3231: 3227: 3204: 3201: 3200: 3180: 3176: 3174: 3171: 3170: 3153: 3149: 3147: 3144: 3143: 3127: 3124: 3123: 3107: 3104: 3103: 3087: 3084: 3083: 3066: 3062: 3060: 3057: 3056: 3040: 3037: 3036: 3016: 3013: 3012: 2996: 2993: 2992: 2972: 2969: 2968: 2951: 2946: 2945: 2936: 2931: 2930: 2928: 2925: 2924: 2923:sitting inside 2907: 2903: 2901: 2898: 2897: 2860: 2855: 2854: 2846: 2837: 2832: 2831: 2823: 2814: 2786: 2785: 2775: 2773: 2767: 2766: 2756: 2751: 2741: 2740: 2739: 2735: 2715: 2712: 2711: 2701: 2670: 2666: 2664: 2661: 2660: 2633: 2629: 2620: 2616: 2614: 2611: 2610: 2581: 2577: 2562: 2558: 2549: 2545: 2543: 2540: 2539: 2507: 2503: 2488: 2484: 2475: 2471: 2469: 2466: 2465: 2445: 2441: 2433: 2430: 2429: 2426: 2369: 2361: 2343: 2339: 2338: 2327: 2314: 2310: 2308: 2305: 2304: 2242: 2238: 2236: 2233: 2232: 2213: 2210: 2209: 2192: 2188: 2186: 2183: 2182: 2163: 2160: 2159: 2133: 2129: 2127: 2124: 2123: 2103: 2100: 2099: 2083: 2080: 2079: 2041: 2037: 2023: 2020: 2019: 1995: 1992: 1991: 1988: 1955: 1951: 1949: 1946: 1945: 1914: 1910: 1862: 1854: 1836: 1832: 1830: 1829: 1825: 1823: 1820: 1819: 1778: 1774: 1765: 1761: 1722: 1714: 1708: 1705: 1704: 1676: 1668: 1663: 1660: 1657: 1656: 1630: 1626: 1624: 1621: 1620: 1597: 1592: 1579: 1575: 1562: 1552: 1550: 1532: 1528: 1526: 1523: 1522: 1497: 1494: 1493: 1467: 1463: 1461: 1458: 1457: 1431: 1427: 1377: 1374: 1373: 1350: 1346: 1335: 1332: 1331: 1309: 1306: 1305: 1288: 1284: 1282: 1279: 1278: 1258: 1254: 1243: 1240: 1239: 1223: 1220: 1219: 1199: 1195: 1184: 1181: 1180: 1158: 1155: 1154: 1128: 1124: 1122: 1119: 1118: 1113: 1078: 1074: 1064: 1059: 1042: 1032: 1030: 1012: 1008: 1006: 1003: 1002: 972: 968: 966: 963: 962: 920: 916: 914: 911: 910: 870: 866: 831: 828: 827: 794: 790: 788: 785: 784: 741: 737: 735: 732: 731: 719: 585: 582: 581: 509: 506:) defined by: ρ 504:strong topology 485: 435: 269: 266: 265: 242: 239: 238: 225: 79: 72: 61: 55: 52: 42:Please help to 41: 25: 21: 12: 11: 5: 3957: 3947: 3946: 3941: 3936: 3931: 3926: 3911: 3910: 3898: 3886: 3874: 3861: 3860: 3859: 3855: 3854: 3820: 3787: 3781: 3765: 3759: 3747:Knapp, Anthony 3743: 3725: 3720:978-3319134666 3719: 3706: 3700: 3687: 3664: 3661: 3660: 3659: 3652: 3649: 3538: 3535: 3534: 3533: 3521: 3501: 3497: 3493: 3490: 3487: 3484: 3481: 3462: 3459: 3440:classification 3431: 3428: 3426: 3423: 3410: 3405: 3401: 3397: 3392: 3388: 3384: 3381: 3378: 3375: 3372: 3369: 3366: 3363: 3358: 3354: 3328: 3323: 3318: 3313: 3308: 3303: 3300: 3297: 3294: 3291: 3288: 3277: 3276: 3263: 3259: 3255: 3250: 3246: 3242: 3239: 3234: 3230: 3226: 3223: 3220: 3217: 3214: 3211: 3208: 3183: 3179: 3156: 3152: 3131: 3111: 3091: 3069: 3065: 3044: 3020: 3000: 2976: 2954: 2949: 2944: 2939: 2934: 2910: 2906: 2894: 2893: 2882: 2875: 2871: 2868: 2863: 2858: 2853: 2849: 2845: 2840: 2835: 2830: 2826: 2821: 2817: 2813: 2810: 2807: 2804: 2795: 2790: 2782: 2779: 2774: 2772: 2769: 2768: 2763: 2760: 2755: 2752: 2750: 2747: 2746: 2744: 2738: 2734: 2731: 2728: 2725: 2722: 2719: 2700: 2697: 2684: 2681: 2678: 2673: 2669: 2641: 2636: 2632: 2628: 2623: 2619: 2607: 2606: 2595: 2590: 2587: 2584: 2580: 2576: 2573: 2568: 2565: 2561: 2557: 2552: 2548: 2533: 2532: 2521: 2516: 2513: 2510: 2506: 2502: 2499: 2494: 2491: 2487: 2483: 2478: 2474: 2448: 2444: 2440: 2437: 2425: 2422: 2414: 2413: 2395: 2394: 2383: 2378: 2375: 2372: 2367: 2364: 2360: 2352: 2349: 2346: 2342: 2336: 2333: 2330: 2326: 2322: 2317: 2313: 2298: 2297: 2286: 2283: 2280: 2277: 2274: 2271: 2268: 2265: 2262: 2259: 2256: 2253: 2250: 2245: 2241: 2217: 2195: 2191: 2167: 2147: 2144: 2141: 2136: 2132: 2107: 2087: 2067: 2064: 2061: 2058: 2055: 2052: 2047: 2044: 2040: 2036: 2033: 2030: 2027: 2016:class function 1999: 1987: 1984: 1972: 1969: 1966: 1963: 1958: 1954: 1942: 1941: 1929: 1923: 1920: 1917: 1913: 1909: 1906: 1903: 1900: 1897: 1894: 1889: 1886: 1883: 1880: 1876: 1871: 1868: 1865: 1860: 1857: 1853: 1845: 1842: 1839: 1835: 1828: 1801: 1800: 1789: 1786: 1781: 1777: 1773: 1768: 1764: 1760: 1757: 1754: 1751: 1748: 1745: 1742: 1739: 1736: 1731: 1728: 1725: 1720: 1717: 1713: 1685: 1682: 1679: 1674: 1671: 1667: 1644: 1641: 1638: 1633: 1629: 1617: 1616: 1605: 1600: 1595: 1591: 1587: 1582: 1578: 1571: 1568: 1565: 1559: 1556: 1549: 1546: 1543: 1540: 1535: 1531: 1507: 1504: 1501: 1481: 1478: 1475: 1470: 1466: 1454: 1453: 1442: 1437: 1434: 1430: 1426: 1423: 1420: 1417: 1414: 1411: 1408: 1405: 1402: 1399: 1396: 1393: 1390: 1387: 1384: 1381: 1358: 1353: 1349: 1345: 1342: 1339: 1319: 1316: 1313: 1291: 1287: 1266: 1261: 1257: 1253: 1250: 1247: 1227: 1207: 1202: 1198: 1194: 1191: 1188: 1168: 1165: 1162: 1142: 1139: 1136: 1131: 1127: 1111: 1097: 1096: 1081: 1077: 1073: 1070: 1067: 1062: 1058: 1051: 1048: 1045: 1039: 1036: 1029: 1026: 1023: 1020: 1015: 1011: 986: 983: 980: 975: 971: 934: 931: 928: 923: 919: 899: 898: 887: 884: 881: 876: 873: 869: 865: 862: 859: 856: 853: 850: 847: 844: 841: 838: 835: 808: 805: 802: 797: 793: 755: 752: 749: 744: 740: 725:consisting of 718: 715: 643: 640: 637: 634: 631: 628: 625: 622: 619: 616: 613: 610: 607: 604: 601: 598: 595: 592: 589: 507: 483: 434: 431: 297: 296: 285: 282: 279: 276: 273: 246: 224: 221: 93:, applying to 77: 74: 73: 28: 26: 19: 9: 6: 4: 3: 2: 3956: 3945: 3942: 3940: 3937: 3935: 3932: 3930: 3927: 3925: 3922: 3921: 3919: 3907: 3902: 3895: 3890: 3883: 3878: 3871: 3866: 3862: 3857: 3856: 3851: 3847: 3843: 3839: 3835: 3831: 3830: 3825: 3821: 3818: 3814: 3810: 3806: 3802: 3798: 3797: 3792: 3788: 3784: 3782:0-8176-4259-5 3778: 3774: 3770: 3766: 3762: 3760:0-691-09089-0 3756: 3752: 3748: 3744: 3740: 3736: 3735: 3730: 3726: 3722: 3716: 3712: 3707: 3703: 3701:0-387-21154-3 3697: 3693: 3688: 3684: 3680: 3676: 3672: 3667: 3666: 3658: 3655: 3654: 3648: 3646: 3642: 3638: 3634: 3630: 3626: 3622: 3618: 3614: 3610: 3605: 3603: 3599: 3595: 3591: 3587: 3583: 3579: 3575: 3571: 3568: 3564: 3560: 3556: 3552: 3548: 3544: 3519: 3491: 3488: 3482: 3479: 3471: 3468: 3467: 3466: 3458: 3456: 3451: 3449: 3445: 3441: 3437: 3422: 3403: 3399: 3390: 3386: 3382: 3373: 3367: 3364: 3356: 3352: 3342: 3326: 3316: 3311: 3301: 3295: 3292: 3289: 3261: 3253: 3248: 3244: 3240: 3237: 3232: 3228: 3215: 3212: 3209: 3199: 3198: 3197: 3181: 3177: 3154: 3150: 3129: 3109: 3089: 3067: 3063: 3042: 3034: 3018: 2998: 2990: 2974: 2952: 2942: 2937: 2908: 2904: 2880: 2873: 2869: 2866: 2861: 2851: 2843: 2838: 2828: 2819: 2811: 2808: 2805: 2802: 2793: 2788: 2777: 2770: 2758: 2753: 2748: 2742: 2736: 2732: 2726: 2720: 2717: 2710: 2709: 2708: 2706: 2696: 2679: 2671: 2667: 2658: 2653: 2634: 2630: 2621: 2617: 2593: 2588: 2585: 2582: 2578: 2574: 2566: 2563: 2559: 2550: 2546: 2538: 2537: 2536: 2519: 2514: 2511: 2508: 2504: 2500: 2492: 2489: 2485: 2476: 2472: 2464: 2463: 2462: 2446: 2442: 2438: 2435: 2421: 2419: 2411: 2407: 2403: 2400: 2399: 2398: 2381: 2373: 2365: 2362: 2358: 2347: 2340: 2334: 2331: 2328: 2324: 2320: 2315: 2311: 2303: 2302: 2301: 2284: 2275: 2269: 2263: 2260: 2257: 2251: 2243: 2239: 2231: 2230: 2229: 2228:, defined by 2215: 2193: 2189: 2181: 2165: 2142: 2134: 2130: 2121: 2105: 2085: 2062: 2056: 2053: 2045: 2042: 2038: 2034: 2031: 2025: 2017: 2013: 1997: 1983: 1970: 1964: 1956: 1952: 1927: 1918: 1911: 1907: 1904: 1901: 1898: 1895: 1892: 1887: 1881: 1878: 1874: 1866: 1858: 1855: 1851: 1840: 1833: 1826: 1818: 1817: 1816: 1814: 1810: 1807: ∈  1806: 1787: 1779: 1775: 1771: 1766: 1762: 1755: 1749: 1743: 1737: 1726: 1718: 1715: 1711: 1703: 1702: 1701: 1680: 1672: 1669: 1665: 1639: 1631: 1627: 1603: 1598: 1593: 1589: 1585: 1580: 1576: 1566: 1563: 1557: 1547: 1541: 1533: 1529: 1521: 1520: 1519: 1505: 1502: 1499: 1476: 1468: 1464: 1440: 1435: 1432: 1424: 1418: 1415: 1409: 1403: 1400: 1397: 1394: 1388: 1385: 1382: 1372: 1371: 1370: 1351: 1347: 1340: 1337: 1317: 1314: 1311: 1289: 1285: 1259: 1255: 1248: 1245: 1225: 1200: 1196: 1192: 1189: 1166: 1163: 1160: 1137: 1129: 1125: 1115: 1110: 1106: 1102: 1079: 1075: 1071: 1068: 1065: 1060: 1056: 1046: 1043: 1037: 1027: 1021: 1013: 1009: 1001: 1000: 999: 981: 973: 969: 960: 956: 952: 948: 929: 921: 917: 908: 904: 885: 879: 874: 871: 867: 860: 857: 851: 845: 839: 833: 826: 825: 824: 822: 803: 795: 791: 782: 778: 774: 770: 766: 750: 742: 738: 728: 724: 713: 711: 707: 703: 699: 695: 691: 686: 684: 679: 677: 673: 669: 665: 662: ∈  661: 657: 638: 635: 632: 626: 620: 614: 608: 605: 602: 596: 590: 579: 576: ∈  575: 571: 567: 563: 559: 555: 551: 547: 546: 542: 535: 533: 529: 525: 521: 517: 513: 505: 501: 497: 493: 489: 481: 477: 473: 468: 466: 462: 457: 455: 451: 450: 444: 440: 430: 428: 424: 421:are dense in 420: 415: 413: 409: 405: 401: 397: 392: 388: 382: 380: 376: 372: 368: 364: 360: 356: 351: 349: 345: 340: 338: 334: 330: 329:endomorphisms 326: 322: 318: 314: 310: 306: 302: 283: 280: 277: 274: 271: 264: 263: 262: 260: 244: 236: 233:of the group 232: 231: 220: 218: 214: 210: 206: 202: 198: 194: 190: 186: 182: 178: 174: 170: 166: 162: 158: 154: 150: 146: 141: 139: 135: 131: 127: 123: 119: 116: 112: 108: 104: 100: 96: 92: 88: 84: 70: 67: 59: 49: 45: 39: 38: 32: 27: 18: 17: 3901: 3896:Section 12.5 3889: 3884:Example 4.10 3877: 3865: 3833: 3827: 3800: 3794: 3772: 3750: 3732: 3710: 3694:, Springer, 3691: 3674: 3670: 3640: 3636: 3632: 3628: 3624: 3620: 3616: 3606: 3601: 3589: 3581: 3577: 3573: 3566: 3562: 3558: 3554: 3550: 3542: 3540: 3469: 3464: 3452: 3435: 3433: 3425:Consequences 3343: 3278: 2895: 2702: 2656: 2654: 2608: 2534: 2427: 2415: 2409: 2405: 2401: 2396: 2299: 2119: 2015: 2014:is called a 2011: 1989: 1943: 1812: 1808: 1804: 1802: 1618: 1518:in the form 1455: 1116: 1108: 1100: 1098: 958: 954: 946: 900: 776: 775:. The group 772: 769:Haar measure 722: 720: 709: 701: 697: 693: 689: 688: 680: 675: 671: 667: 663: 659: 655: 577: 573: 565: 561: 557: 553: 548:to be those 544: 540: 538: 536: 531: 527: 523: 519: 515: 511: 499: 495: 491: 487: 479: 475: 471: 469: 464: 460: 458: 454:circle group 447: 442: 436: 426: 422: 418: 416: 400:matrix group 395: 390: 384: 379:uniform norm 374: 370: 358: 354: 353: 341: 336: 332: 320: 316: 304: 300: 298: 258: 234: 228: 226: 216: 212: 208: 200: 196: 192: 188: 176: 172: 168: 160: 156: 152: 144: 142: 130:finite group 117: 107:Hermann Weyl 86: 80: 62: 53: 34: 3677:: 737–755, 3598:Élie Cartan 1990:A function 138:Issai Schur 111:Fritz Peter 83:mathematics 48:introducing 3918:Categories 3906:Knapp 2002 3872:Chapter 12 3692:Lie groups 3671:Math. Ann. 3663:References 3623:: Because 3035:of degree 2991:of degree 903:Knapp 1986 771:exists on 706:direct sum 683:Knapp 1986 412:Knapp 1986 404:Knapp 1986 348:Knapp 1986 309:continuous 56:March 2024 31:references 3894:Hall 2015 3882:Hall 2015 3870:Hall 2015 3739:EMS Press 3586:Lie group 3565:), where 3547:Hausdorff 3512:for some 3483:⁡ 3368:⁡ 3302:∈ 3296:β 3290:α 3254:β 3238:α 3222:↦ 3216:β 3210:α 3130:β 3110:α 2852:β 2829:α 2812:∈ 2809:β 2803:α 2781:¯ 2778:α 2771:β 2762:¯ 2759:β 2754:− 2749:α 2721:⁡ 2589:θ 2567:θ 2515:θ 2493:θ 2473:π 2374:π 2348:π 2325:∑ 2316:π 2312:χ 2270:π 2264:⁡ 2244:π 2240:χ 2216:π 2194:π 2190:χ 2180:character 2166:π 2043:− 1919:π 1908:≤ 1896:≤ 1885:Σ 1882:∈ 1879:π 1875:∣ 1867:π 1841:π 1803:for each 1785:⟩ 1750:π 1747:⟨ 1727:π 1681:π 1599:∗ 1594:π 1586:⊗ 1581:π 1570:Σ 1567:∈ 1564:π 1558:^ 1555:⨁ 1503:× 1433:− 1419:π 1404:π 1395:⋅ 1369:given by 1352:π 1341:⁡ 1315:× 1290:π 1260:π 1249:⁡ 1201:π 1190:π 1164:× 1080:π 1072:⁡ 1066:⊕ 1061:π 1050:Σ 1047:∈ 1044:π 1038:^ 1035:⨁ 872:− 834:ρ 819:given by 642:⟩ 630:⟨ 624:⟩ 609:ρ 591:ρ 588:⟨ 502:with the 408:Lie group 391:algebraic 344:Bump 2004 284:π 281:∘ 272:φ 245:φ 97:that are 3858:Specific 3771:(2002), 3749:(1986), 3651:See also 2078:for all 700:. Then 654:for all 580:; i.e., 572:for all 526:into GL( 486: : 346:, §4.1; 3850:2372901 3817:1970281 3741:, 2001 3594:theorem 3470:Theorem 2402:Theorem 2178:is the 1105:closure 568:) is a 562:unitary 449:actions 128:of any 103:abelian 99:compact 44:improve 3848:  3815:  3779:  3757:  3717:  3698:  3639:is an 3576:in GL( 2878:  2800:  2797:  821:acting 779:has a 520:∗(g,v) 319:, and 85:, the 33:, but 3846:JSTOR 3813:JSTOR 3609:limit 3436:basis 2705:SU(2) 2261:trace 783:ρ on 564:if ρ( 398:is a 373:) on 363:dense 323:is a 179:) of 3777:ISBN 3755:ISBN 3715:ISBN 3696:ISBN 3570:acts 3455:here 3169:and 3122:and 2098:and 670:→ U( 518:) = 459:Let 143:Let 136:and 3838:doi 3805:doi 3679:doi 3635:), 3596:of 3588:GL( 3557:in 3102:in 2707:as 2208:of 2118:in 2018:if 2010:on 1338:End 1246:End 1218:of 1069:dim 953:of 909:of 556:on 498:to 441:of 429:). 361:is 331:of 315:of 257:on 207:of 195:on 187:of 167:on 151:of 81:In 3920:: 3844:, 3834:83 3832:, 3811:, 3801:73 3799:, 3737:, 3731:, 3675:97 3673:, 3647:. 3480:GL 3457:. 3450:. 3365:SU 3341:. 2718:SU 2420:. 729:, 658:, 514:)( 490:→ 478:→ 474:× 369:C( 311:) 227:A 140:. 3853:. 3840:: 3807:: 3786:. 3764:. 3724:. 3705:. 3686:. 3681:: 3637:G 3633:G 3631:( 3629:L 3625:G 3621:G 3617:V 3602:G 3590:V 3582:G 3578:V 3574:G 3567:G 3563:G 3561:( 3559:L 3555:V 3551:G 3543:G 3532:. 3520:n 3500:) 3496:C 3492:; 3489:n 3486:( 3409:) 3404:3 3400:S 3396:( 3391:2 3387:L 3383:= 3380:) 3377:) 3374:2 3371:( 3362:( 3357:2 3353:L 3327:4 3322:R 3317:= 3312:2 3307:C 3299:) 3293:, 3287:( 3262:m 3258:) 3249:2 3245:z 3241:+ 3233:1 3229:z 3225:( 3219:) 3213:, 3207:( 3182:2 3178:z 3155:1 3151:z 3090:m 3068:3 3064:S 3043:m 3019:m 2999:m 2975:m 2953:4 2948:R 2943:= 2938:2 2933:C 2909:3 2905:S 2881:, 2874:} 2870:1 2867:= 2862:2 2857:| 2848:| 2844:+ 2839:2 2834:| 2825:| 2820:, 2816:C 2806:, 2794:: 2789:) 2743:( 2737:{ 2733:= 2730:) 2727:2 2724:( 2683:) 2680:G 2677:( 2672:2 2668:L 2657:G 2640:) 2635:1 2631:S 2627:( 2622:2 2618:L 2594:. 2586:n 2583:i 2579:e 2575:= 2572:) 2564:i 2560:e 2556:( 2551:n 2547:u 2520:. 2512:n 2509:i 2505:e 2501:= 2498:) 2490:i 2486:e 2482:( 2477:n 2447:1 2443:S 2439:= 2436:G 2412:. 2410:G 2406:G 2382:. 2377:) 2371:( 2366:i 2363:i 2359:u 2351:) 2345:( 2341:d 2335:1 2332:= 2329:i 2321:= 2285:. 2282:) 2279:) 2276:g 2273:( 2267:( 2258:= 2255:) 2252:g 2249:( 2146:) 2143:G 2140:( 2135:2 2131:L 2120:G 2106:h 2086:g 2066:) 2063:g 2060:( 2057:f 2054:= 2051:) 2046:1 2039:h 2035:g 2032:h 2029:( 2026:f 2012:G 1998:f 1971:. 1968:) 1965:G 1962:( 1957:2 1953:L 1928:} 1922:) 1916:( 1912:d 1905:j 1902:, 1899:i 1893:1 1888:, 1870:) 1864:( 1859:j 1856:i 1852:u 1844:) 1838:( 1834:d 1827:{ 1813:d 1809:G 1805:g 1788:. 1780:i 1776:e 1772:, 1767:j 1763:e 1759:) 1756:g 1753:( 1744:= 1741:) 1738:g 1735:( 1730:) 1724:( 1719:j 1716:i 1712:u 1684:) 1678:( 1673:j 1670:i 1666:u 1643:) 1640:G 1637:( 1632:2 1628:L 1604:. 1590:E 1577:E 1548:= 1545:) 1542:G 1539:( 1534:2 1530:L 1506:G 1500:G 1480:) 1477:G 1474:( 1469:2 1465:L 1441:. 1436:1 1429:) 1425:h 1422:( 1416:A 1413:) 1410:g 1407:( 1401:= 1398:A 1392:) 1389:h 1386:, 1383:g 1380:( 1357:) 1348:E 1344:( 1318:G 1312:G 1286:E 1265:) 1256:E 1252:( 1226:G 1206:) 1197:E 1193:, 1187:( 1167:G 1161:G 1141:) 1138:G 1135:( 1130:2 1126:L 1112:π 1109:E 1101:G 1076:E 1057:E 1028:= 1025:) 1022:G 1019:( 1014:2 1010:L 985:) 982:G 979:( 974:2 970:L 959:G 957:( 955:L 947:G 933:) 930:G 927:( 922:2 918:L 886:. 883:) 880:g 875:1 868:h 864:( 861:f 858:= 855:) 852:g 849:( 846:f 843:) 840:h 837:( 807:) 804:G 801:( 796:2 792:L 777:G 773:G 754:) 751:G 748:( 743:2 739:L 723:G 712:. 710:G 702:H 698:H 694:G 676:C 672:H 668:G 664:H 660:w 656:v 639:w 636:, 633:v 627:= 621:w 618:) 615:g 612:( 606:, 603:v 600:) 597:g 594:( 578:G 574:g 566:g 558:H 554:G 545:H 541:G 532:H 528:H 524:G 516:v 512:g 510:( 508:∗ 500:H 496:H 492:H 488:G 484:∗ 480:H 476:H 472:G 465:H 461:G 443:G 427:G 425:( 423:L 419:G 402:( 396:G 381:. 375:G 371:G 359:G 337:V 333:V 321:L 317:G 305:V 301:G 278:L 275:= 259:G 235:G 217:G 213:G 211:( 209:L 201:G 199:( 197:L 193:G 189:G 177:G 175:( 173:L 169:G 161:G 159:( 157:C 153:G 145:G 120:( 118:G 69:) 63:( 58:) 54:( 40:.

Index

references
inline citations
improve
introducing
Learn how and when to remove this message
mathematics
harmonic analysis
topological groups
compact
abelian
Hermann Weyl
Fritz Peter
topological group
Peter & Weyl 1927
regular representation
finite group
Ferdinand Georg Frobenius
Issai Schur
irreducible representations
complex-valued functions
square-integrable functions
unitary representations
orthonormal basis
matrix coefficient
continuous
group representation
linear functional
endomorphisms
Bump 2004
Knapp 1986

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.