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Free variables and bound variables

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if at least one occurrence of it is bound. Since the same variable symbol may appear in multiple places in an expression, some occurrences of the variable symbol may be free while others are bound, hence "free" and "bound" are at first defined for occurrences and then generalized over all occurrences
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While the domain of discourse in many contexts is understood, when an explicit range of values for the bound variable has not been given, it may be necessary to specify the domain in order to properly evaluate the expression. For example, consider the following expression in which both variables are
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of said variable symbol in the expression. However it is done, the variable ceases to be an independent variable on which the value of the expression depends, whether that value be a truth value or the numerical result of a calculation, or, more generally, an element of an image set of a function.
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Variables bound at the top level of a program are technically free variables within the terms to which they are bound but are often treated specially because they can be compiled as fixed addresses. Similarly, an identifier bound to a
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The term "dummy variable" is also sometimes used for a bound variable (more commonly in general mathematics than in computer science), but this should not be confused with the identically named but unrelated concept of
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which act on functions of the bound variable. In more complicated contexts, such notations can become awkward and confusing. It can be useful to switch to notations which make the binding explicit, such as
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English does allow specifying coreference, but it is optional, as both interpretations of the previous example are valid (the ungrammatical interpretation is indicated with an asterisk):
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is an operator with two parameters—a one-parameter function, and a set to evaluate that function over. The other operators listed above can be expressed in similar ways; for example, the
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whose leaf nodes are variables, constants, function constants or predicate constants and whose non-leaf nodes are logical operators. This expression can then be determined by doing an
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Before stating a precise definition of free variable and bound variable, the following are some examples that perhaps make these two concepts clearer than the definition would:
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More widely, in most proofs, bound variables are used. For example, the following proof shows that all squares of positive even integers are divisible by
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Variable-binding mechanisms occur in different contexts in mathematics, logic and computer science. In all cases, however, they are purely
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indicating both the semantic subject and the semantic object of sentence as being bound. This returns the semantic interpretation
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properties of expressions and variables in them. For this section we can summarize syntax by identifying an expression with a
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can only refer to a female that is not Ashley. This means that it can never have a reflexive meaning equivalent to
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The distinction is not purely of academic interest, as some languages do actually have different forms for
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and it may contain other variables. In this case we say that function definition binds the variables
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The first interpretation is impossible. Only the second interpretation is permitted by the grammar.
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may take place and is not a parameter of this or any container expression. The idea is related to a
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that occur in almost every formal language. A binding operator Q takes two arguments: a variable
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Thus, it can be seen that reflexives and reciprocals are bound variables (known technically as
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In this manner, function definition expressions of the kind shown above can be thought of as
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coindexed is permissible, but the other interpretation where they are not coindexed is
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is a bound variable; consequently the value of this expression depends on the value of
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is a bound variable; consequently the value of this expression depends on the value of
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is a bound variable; consequently the value of this expression depends on the value of
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To give an example from mathematics, consider an expression which defines a function
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is also technically a free variable within its own body but is treated specially.
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is the predicate function (a lambda abstraction) with the lambda notation and
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position. Indicating the coindexation, the first interpretation with
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Pronouns can also behave in a different way. In the sentence below
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variable binding operator, analogous to the lambda expressions of
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as used in statistics, most commonly in regression analysis.
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have been used as bound variables as a whole in the proof.
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is can be established according to the situational (i.e.
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applying to a function. So, for example, the expression
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can be thought of as an operator that evaluates to the
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is rebound in this term. This nested, inner binding of
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for that variable in an expression and a non-leaf node
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For free variables in systems of linear equations, see
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is said to "shadow" the outer binding. Occurrences of
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is a positive integer".) A variable symbol overall is
2670:. Vol. 30. Mathematical Association of America. 2621: 1806: 1771: 1717: 1666: 1527: 1306: 1230: 1151: 1013: 971: 944: 901: 872: 852: 846:
be a positive even integer. Then there is an integer
832: 809: 696: 594: 557:{\displaystyle \int _{0}^{\infty }x^{y-1}e^{-x}\,dx,} 499: 416: 370: 350: 286: 254: 2403:The coreference binding can be represented using a 74:. Unsourced material may be challenged and removed. 2081:could be referring to Lisa's book (an instance of 1836: 1789: 1754: 1697: 1587: 1412:Variable binding relates three things: a variable 1362: 1277: 1210: 1111: 977: 957: 930: 887: 858: 838: 815: 758: 658: 556: 461: 376: 356: 329: 260: 2031:, natural languages can be seen to have free and 1278:{\displaystyle D\left(x\mapsto x^{2}+2x+1\right)} 748: 717: 202:that will later be replaced by some value), or a 19:For bound variables in computer programming, see 3863: 2605:(1981). Harvard University Press, 0-674-55451-5. 1078: 596: 2065:In the sentence above, the possessive pronoun 1409:of the language and does not concern us here. 1300:Tree summarizing the syntax of the expression 759:{\displaystyle \forall x\ \exists y\ {\Big },} 2811: 999: 2105:indicates a second referent (different from 1385:of the tree. Variable-binding operators are 2317:can only refer to the previously mentioned 1942:. Unsourced material may be challenged and 1901:Learn how and when to remove these messages 1755:{\displaystyle \sum _{S}{(x\mapsto x^{2})}} 788:of this expression depends on the value of 28:Free variables (system of linear equations) 2818: 2804: 16:Concept in mathematics or computer science 3846:Regiomontanus' angle maximization problem 2597: 2595: 2015:Learn how and when to remove this message 1962:Learn how and when to remove this message 1855:applied over the (possibly infinite) set 1326: 1313: 1068: 544: 300: 293: 134:Learn how and when to remove this message 3689: 2638: 2627: 2077:or to any other female. In other words, 1295: 3194:Differentiating under the integral sign 2408: 1513: 462:{\displaystyle \sum _{k=1}^{10}f(k,n),} 206:that stands for an unspecified symbol. 3864: 2714:The Princeton Companion to Mathematics 2643:. Wokingham, England: Addison-Wesley. 2641:Type theory and functional programming 2592: 388:if the domain is the complex numbers. 3070:Inverse functions and differentiation 2799: 2435:is the subject referent argument and 1698:{\displaystyle \sum _{x\in S}{x^{2}}} 1606:may contain some, all or none of the 1510:is one containing no free variables. 1291: 780:are bound variables, associated with 186:(symbol) that specifies places in an 150:, and in other disciplines involving 2665: 1973: 1940:adding citations to reliable sources 1907: 1866: 1837:{\displaystyle \forall x\in S\ P(x)} 1649:. Other binding operators, like the 236:An instance of a variable symbol is 233:is often a synonym in this context. 83:"Free variables and bound variables" 72:adding citations to reliable sources 43: 2113:has the following interpretations: 1862: 1708:could be treated as a notation for 1126:. Each of them binds the variable 213:, the term free variable refers to 13: 2868:Free variables and bound variables 2693: 2051:, etc. can act as free variables. 1807: 1320: 1307: 1103: 1095: 1060: 706: 697: 510: 294: 287: 14: 3898: 3673:The Method of Mechanical Theorems 2668:A Tour through Mathematical Logic 2616:A Tour through Mathematical Logic 1882:This section has multiple issues. 3228:Partial fractions in integration 3144:Stochastic differential equation 1977: 1912: 1871: 1491:are free occurrences of the new 1451:and a free variable in the term 1447:is a bound variable in the term 48: 3366:Jacobian matrix and determinant 3221:Tangent half-angle substitution 3189:Fundamental theorem of calculus 2271:= of a female that is not Lisa) 2162:= of a female that is not Lisa) 1890:or discuss these issues on the 1102: 1101: 1094: 1093: 1076: 1075: 1049: 1048: 1031: 1030: 59:needs additional citations for 3442:Arithmetico-geometric sequence 3134:Ordinary differential equation 2608: 2526:= a female that is not Ashley) 1831: 1825: 1748: 1735: 1729: 1574: 1571: 1539: 1357: 1354: 1348: 1339: 1336: 1330: 1317: 1314: 1242: 1200: 1188: 1182: 1085: 792:, but there is nothing called 743: 725: 680:, but there is nothing called 644: 638: 629: 617: 603: 578:, but there is nothing called 483:, but there is nothing called 453: 441: 277:bound by logical quantifiers: 1: 3265:Integro-differential equation 3139:Partial differential equation 2585: 2539:government and binding theory 2407:as mentioned in the previous 340:This expression evaluates to 2825: 2399:= a female that is not Jane) 2073:to the previously mentioned 1790:{\displaystyle \sum _{S}{f}} 931:{\displaystyle n^{2}=4k^{2}} 7: 3419:Generalized Stokes' theorem 3206:Integration by substitution 2548: 2101:indicates one referent and 2069:is a free variable. It may 1653:sign, can be thought of as 399: 229:of that function. The term 39:Dummy variable (statistics) 10: 3905: 2948:(ε, δ)-definition of limit 2723:Princeton University Press 2555:Closure (computer science) 2409:Formal explanation section 1124:variable-binding operators 1000:Variable-binding operators 800:on which it could depend. 684:on which it could depend. 582:on which it could depend. 487:on which it could depend. 32: 25: 18: 3841:Proof that 22/7 exceeds Ď€ 3778: 3756: 3682: 3630:Gottfried Wilhelm Leibniz 3600: 3577:e (mathematical constant) 3562: 3434: 3341: 3273: 3154: 2956: 2911: 2833: 2618:(2005). 978-0-88385-036-7 384:is the real numbers, but 3592:Stirling's approximation 3065:Implicit differentiation 3013:Rules of differentiation 2666:Wolf, Robert S. (2005). 2639:Thompson, Simon (1991). 3826:Euler–Maclaurin formula 3731:trigonometric functions 3184:Constant of integration 2451:being the same person. 2035:variables. In English, 1850:Boolean-valued function 1588:{\displaystyle f=\left} 772:is a free variable and 672:is a free variable and 570:is a free variable and 475:is a free variable and 3795:Differential geometry 3640:Infinitesimal calculus 3343:Multivariable calculus 3291:Directional derivative 3097:Second derivative test 3075:Logarithmic derivative 3048:General Leibniz's rule 2943:Order of approximation 2109:). Thus, the sentence 1838: 1791: 1756: 1699: 1655:higher-order functions 1589: 1370: 1364: 1279: 1212: 1113: 979: 959: 932: 889: 860: 840: 817: 760: 660: 558: 463: 437: 378: 358: 331: 262: 3872:Mathematical notation 3714:logarithmic functions 3709:exponential functions 3625:Generality of algebra 3503:Tests of convergence 3129:Differential equation 3113:Further applications 3102:Extreme value theorem 3092:First derivative test 2986:Differential operator 2958:Differential calculus 2731:10.1515/9781400830398 2719:Princeton, New Jersey 2543:Binding (linguistics) 2329:is bound to the noun 2192:translate coreferent 1839: 1792: 1757: 1700: 1590: 1365: 1299: 1288:for differentiation. 1280: 1213: 1114: 980: 960: 958:{\displaystyle n^{2}} 933: 890: 861: 841: 818: 761: 661: 559: 464: 417: 379: 359: 332: 263: 3882:Computer programming 3779:Miscellaneous topics 3719:hyperbolic functions 3704:irrational functions 3582:Exponential function 3435:Sequences and series 3201:Integration by parts 2522:(interpretation #2: 2496:(interpretation #1: 2395:(interpretation #2: 2368:(interpretation #1: 2267:(interpretation #2: 2240:(interpretation #1: 2158:(interpretation #2: 2132:(interpretation #1: 1936:improve this section 1804: 1799:universal quantifier 1769: 1715: 1664: 1525: 1514:Function expressions 1304: 1228: 1149: 1011: 969: 942: 899: 888:{\displaystyle n=2k} 870: 850: 830: 807: 694: 592: 497: 414: 368: 348: 284: 252: 211:computer programming 68:improve this article 3766:List of derivatives 3602:History of calculus 3517:Cauchy condensation 3414:Exterior derivative 3371:Lagrange multiplier 3107:Maximum and minimum 2938:Limit of a sequence 2926:Limit of a function 2873:Graph of a function 2853:Continuous function 2686:10.4169/j.ctt5hh94h 2575:Scope (programming) 2293:reciprocal pronouns 2111:Lisa found her book 1846:logical conjunction 1471:contains a subterm 1064: 784:; consequently the 782:logical quantifiers 514: 490:In the expression 242:domain of discourse 3699:rational functions 3666:Method of Fluxions 3512:Alternating series 3409:Differential forms 3391:Partial derivative 3351:Divergence theorem 3233:Quadratic integral 3001:Leibniz's notation 2991:Mean value theorem 2976:Partial derivative 2921:Indeterminate form 2725:. pp. 15–16. 2705:Barrow-Green, June 2603:Mathematical Logic 2474:Ashley hit herself 2277:reflexive pronouns 2205:and noncoreferent 1989:. You can help by 1834: 1787: 1781: 1752: 1727: 1695: 1682: 1602:is an expression. 1585: 1501:recursive function 1393:and an expression 1371: 1360: 1292:Formal explanation 1275: 1208: 1173: 1137:Many of these are 1109: 1092: 1050: 1047: 1029: 975: 955: 928: 885: 856: 836: 813: 756: 687:In the expression 656: 610: 585:In the expression 554: 500: 459: 407:In the expression 374: 354: 327: 258: 231:non-local variable 204:wildcard character 178:, respectively. A 156:mathematical logic 3859: 3858: 3785:Complex calculus 3774: 3773: 3655:Law of Continuity 3587:Natural logarithm 3572:Bernoulli numbers 3563:Special functions 3522:Direct comparison 3386:Multiple integral 3260:Integral equation 3156:Integral calculus 3087:Stationary points 3061:Other techniques 3006:Newton's notation 2971:Second derivative 2863:Finite difference 2740:978-0-691-11880-2 2677:978-0-88385-042-8 2560:Combinatory logic 2405:lambda expression 2037:personal pronouns 2027:When analyzed in 2025: 2024: 2017: 2007: 2006: 1972: 1971: 1964: 1905: 1821: 1772: 1718: 1667: 1387:logical operators 1383:inorder traversal 1152: 1077: 1032: 1014: 978:{\displaystyle 4} 859:{\displaystyle k} 839:{\displaystyle n} 816:{\displaystyle 4} 714: 705: 651: 595: 377:{\displaystyle y} 357:{\displaystyle x} 344:if the domain of 317: 261:{\displaystyle n} 221:that are neither 168:apparent variable 144: 143: 136: 118: 3894: 3789:Contour integral 3687: 3686: 3537:Limit comparison 3446:Types of series 3405:Advanced topics 3396:Surface integral 3240:Trapezoidal rule 3179:Basic properties 3174:Riemann integral 3122:Taylor's theorem 2848:Concave function 2843:Binomial theorem 2820: 2813: 2806: 2797: 2796: 2792: 2689: 2662: 2631: 2625: 2619: 2614:Robert S. Wolf, 2612: 2606: 2601:W. V. O. Quine, 2599: 2029:formal semantics 2020: 2013: 2002: 1999: 1981: 1974: 1967: 1960: 1956: 1953: 1947: 1916: 1908: 1897: 1875: 1874: 1867: 1863:Natural language 1843: 1841: 1840: 1835: 1819: 1796: 1794: 1793: 1788: 1786: 1780: 1761: 1759: 1758: 1753: 1751: 1747: 1746: 1726: 1704: 1702: 1701: 1696: 1694: 1693: 1692: 1681: 1594: 1592: 1591: 1586: 1584: 1580: 1570: 1569: 1551: 1550: 1494: 1490: 1486: 1482: 1478: 1474: 1470: 1466: 1462: 1458: 1454: 1450: 1446: 1369: 1367: 1366: 1361: 1284: 1282: 1281: 1276: 1274: 1270: 1254: 1253: 1217: 1215: 1214: 1209: 1207: 1203: 1172: 1122:are some common 1118: 1116: 1115: 1110: 1091: 1063: 1058: 1046: 1028: 984: 982: 981: 976: 964: 962: 961: 956: 954: 953: 937: 935: 934: 929: 927: 926: 911: 910: 894: 892: 891: 886: 865: 863: 862: 857: 845: 843: 842: 837: 822: 820: 819: 814: 765: 763: 762: 757: 752: 751: 721: 720: 712: 703: 665: 663: 662: 657: 652: 647: 612: 609: 563: 561: 560: 555: 543: 542: 530: 529: 513: 508: 468: 466: 465: 460: 436: 431: 383: 381: 380: 375: 363: 361: 360: 355: 336: 334: 333: 328: 323: 319: 318: 313: 267: 265: 264: 259: 160:computer science 152:formal languages 139: 132: 128: 125: 119: 117: 76: 52: 44: 3904: 3903: 3897: 3896: 3895: 3893: 3892: 3891: 3887:Predicate logic 3862: 3861: 3860: 3855: 3851:Steinmetz solid 3836:Integration Bee 3770: 3752: 3678: 3620:Colin Maclaurin 3596: 3564: 3558: 3430: 3424:Tensor calculus 3401:Volume integral 3337: 3312:Basic theorems 3275:Vector calculus 3269: 3150: 3117:Newton's method 2952: 2931:One-sided limit 2907: 2888:Rolle's theorem 2878:Linear function 2829: 2824: 2741: 2711:, eds. (2008). 2701:Gowers, Timothy 2696: 2694:Further reading 2678: 2651: 2635: 2634: 2626: 2622: 2613: 2609: 2600: 2593: 2588: 2551: 2519: 2513: 2493: 2487: 2392: 2386: 2365: 2359: 2333:that occurs in 2321:, in this case 2264: 2258: 2237: 2231: 2212: 2199: 2184:: for example, 2182: 2173: 2155: 2149: 2129: 2123: 2021: 2010: 2009: 2008: 2003: 1997: 1994: 1987:needs expansion 1968: 1957: 1951: 1948: 1933: 1917: 1876: 1872: 1865: 1805: 1802: 1801: 1782: 1776: 1770: 1767: 1766: 1742: 1738: 1728: 1722: 1716: 1713: 1712: 1688: 1684: 1683: 1671: 1665: 1662: 1661: 1647:lambda calculus 1637: 1628: 1621: 1612: 1565: 1561: 1546: 1542: 1538: 1534: 1526: 1523: 1522: 1516: 1492: 1488: 1484: 1480: 1476: 1472: 1468: 1464: 1460: 1456: 1452: 1448: 1444: 1441:lambda calculus 1305: 1302: 1301: 1294: 1249: 1245: 1238: 1234: 1229: 1226: 1225: 1178: 1174: 1156: 1150: 1147: 1146: 1081: 1059: 1054: 1036: 1018: 1012: 1009: 1008: 1002: 970: 967: 966: 949: 945: 943: 940: 939: 922: 918: 906: 902: 900: 897: 896: 871: 868: 867: 851: 848: 847: 831: 828: 827: 808: 805: 804: 747: 746: 716: 715: 695: 692: 691: 613: 611: 599: 593: 590: 589: 535: 531: 519: 515: 509: 504: 498: 495: 494: 432: 421: 415: 412: 411: 402: 369: 366: 365: 349: 346: 345: 312: 305: 301: 285: 282: 281: 253: 250: 249: 223:local variables 140: 129: 123: 120: 77: 75: 65: 53: 42: 31: 24: 17: 12: 11: 5: 3902: 3901: 3890: 3889: 3884: 3879: 3874: 3857: 3856: 3854: 3853: 3848: 3843: 3838: 3833: 3831:Gabriel's horn 3828: 3823: 3822: 3821: 3816: 3811: 3806: 3801: 3793: 3792: 3791: 3782: 3780: 3776: 3775: 3772: 3771: 3769: 3768: 3763: 3761:List of limits 3757: 3754: 3753: 3751: 3750: 3749: 3748: 3743: 3738: 3728: 3727: 3726: 3716: 3711: 3706: 3701: 3695: 3693: 3684: 3680: 3679: 3677: 3676: 3669: 3662: 3660:Leonhard Euler 3657: 3652: 3647: 3642: 3637: 3632: 3627: 3622: 3617: 3612: 3606: 3604: 3598: 3597: 3595: 3594: 3589: 3584: 3579: 3574: 3568: 3566: 3560: 3559: 3557: 3556: 3555: 3554: 3549: 3544: 3539: 3534: 3529: 3524: 3519: 3514: 3509: 3501: 3500: 3499: 3494: 3493: 3492: 3487: 3477: 3472: 3467: 3462: 3457: 3452: 3444: 3438: 3436: 3432: 3431: 3429: 3428: 3427: 3426: 3421: 3416: 3411: 3403: 3398: 3393: 3388: 3383: 3378: 3373: 3368: 3363: 3361:Hessian matrix 3358: 3353: 3347: 3345: 3339: 3338: 3336: 3335: 3334: 3333: 3328: 3323: 3318: 3316:Line integrals 3310: 3309: 3308: 3303: 3298: 3293: 3288: 3279: 3277: 3271: 3270: 3268: 3267: 3262: 3257: 3256: 3255: 3250: 3242: 3237: 3236: 3235: 3225: 3224: 3223: 3218: 3213: 3203: 3198: 3197: 3196: 3186: 3181: 3176: 3171: 3166: 3164:Antiderivative 3160: 3158: 3152: 3151: 3149: 3148: 3147: 3146: 3141: 3136: 3126: 3125: 3124: 3119: 3111: 3110: 3109: 3104: 3099: 3094: 3084: 3083: 3082: 3077: 3072: 3067: 3059: 3058: 3057: 3052: 3051: 3050: 3040: 3035: 3030: 3025: 3020: 3010: 3009: 3008: 3003: 2993: 2988: 2983: 2978: 2973: 2968: 2962: 2960: 2954: 2953: 2951: 2950: 2945: 2940: 2935: 2934: 2933: 2923: 2917: 2915: 2909: 2908: 2906: 2905: 2900: 2895: 2890: 2885: 2880: 2875: 2870: 2865: 2860: 2855: 2850: 2845: 2839: 2837: 2831: 2830: 2823: 2822: 2815: 2808: 2800: 2794: 2793: 2739: 2695: 2692: 2691: 2690: 2676: 2663: 2649: 2633: 2632: 2620: 2607: 2590: 2589: 2587: 2584: 2583: 2582: 2577: 2572: 2567: 2565:Lambda lifting 2562: 2557: 2550: 2547: 2528: 2527: 2515: 2509: 2505: 2489: 2483: 2466: 2465: 2445:JANE hurt JANE 2429: 2428: 2401: 2400: 2388: 2382: 2377: 2361: 2355: 2313:the reflexive 2311: 2310: 2273: 2272: 2260: 2254: 2249: 2233: 2227: 2208: 2195: 2178: 2169: 2164: 2163: 2151: 2145: 2141: 2125: 2119: 2063: 2062: 2023: 2022: 2005: 2004: 1984: 1982: 1970: 1969: 1920: 1918: 1911: 1906: 1880: 1879: 1877: 1870: 1864: 1861: 1833: 1830: 1827: 1824: 1818: 1815: 1812: 1809: 1785: 1779: 1775: 1763: 1762: 1750: 1745: 1741: 1737: 1734: 1731: 1725: 1721: 1706: 1705: 1691: 1687: 1680: 1677: 1674: 1670: 1633: 1626: 1617: 1610: 1596: 1595: 1583: 1579: 1576: 1573: 1568: 1564: 1560: 1557: 1554: 1549: 1545: 1541: 1537: 1533: 1530: 1515: 1512: 1424:of the form Q( 1359: 1356: 1353: 1350: 1347: 1344: 1341: 1338: 1335: 1332: 1329: 1325: 1322: 1319: 1316: 1312: 1309: 1293: 1290: 1286: 1285: 1273: 1269: 1266: 1263: 1260: 1257: 1252: 1248: 1244: 1241: 1237: 1233: 1219: 1218: 1206: 1202: 1199: 1196: 1193: 1190: 1187: 1184: 1181: 1177: 1171: 1168: 1165: 1162: 1159: 1155: 1120: 1119: 1108: 1105: 1100: 1097: 1090: 1087: 1084: 1080: 1074: 1071: 1067: 1062: 1057: 1053: 1045: 1042: 1039: 1035: 1027: 1024: 1021: 1017: 1004:The following 1001: 998: 986: 985: 974: 952: 948: 925: 921: 917: 914: 909: 905: 884: 881: 878: 875: 855: 835: 812: 767: 766: 755: 750: 745: 742: 739: 736: 733: 730: 727: 724: 719: 711: 708: 702: 699: 667: 666: 655: 650: 646: 643: 640: 637: 634: 631: 628: 625: 622: 619: 616: 608: 605: 602: 598: 565: 564: 553: 550: 547: 541: 538: 534: 528: 525: 522: 518: 512: 507: 503: 470: 469: 458: 455: 452: 449: 446: 443: 440: 435: 430: 427: 424: 420: 401: 398: 394:dummy variable 373: 353: 338: 337: 326: 322: 316: 311: 308: 304: 299: 296: 292: 289: 257: 176:bound variable 142: 141: 56: 54: 47: 35:Free parameter 15: 9: 6: 4: 3: 2: 3900: 3899: 3888: 3885: 3883: 3880: 3878: 3877:Logic symbols 3875: 3873: 3870: 3869: 3867: 3852: 3849: 3847: 3844: 3842: 3839: 3837: 3834: 3832: 3829: 3827: 3824: 3820: 3817: 3815: 3812: 3810: 3807: 3805: 3802: 3800: 3797: 3796: 3794: 3790: 3787: 3786: 3784: 3783: 3781: 3777: 3767: 3764: 3762: 3759: 3758: 3755: 3747: 3744: 3742: 3739: 3737: 3734: 3733: 3732: 3729: 3725: 3722: 3721: 3720: 3717: 3715: 3712: 3710: 3707: 3705: 3702: 3700: 3697: 3696: 3694: 3692: 3688: 3685: 3681: 3675: 3674: 3670: 3668: 3667: 3663: 3661: 3658: 3656: 3653: 3651: 3648: 3646: 3643: 3641: 3638: 3636: 3635:Infinitesimal 3633: 3631: 3628: 3626: 3623: 3621: 3618: 3616: 3613: 3611: 3608: 3607: 3605: 3603: 3599: 3593: 3590: 3588: 3585: 3583: 3580: 3578: 3575: 3573: 3570: 3569: 3567: 3561: 3553: 3550: 3548: 3545: 3543: 3540: 3538: 3535: 3533: 3530: 3528: 3525: 3523: 3520: 3518: 3515: 3513: 3510: 3508: 3505: 3504: 3502: 3498: 3495: 3491: 3488: 3486: 3483: 3482: 3481: 3478: 3476: 3473: 3471: 3468: 3466: 3463: 3461: 3458: 3456: 3453: 3451: 3448: 3447: 3445: 3443: 3440: 3439: 3437: 3433: 3425: 3422: 3420: 3417: 3415: 3412: 3410: 3407: 3406: 3404: 3402: 3399: 3397: 3394: 3392: 3389: 3387: 3384: 3382: 3379: 3377: 3376:Line integral 3374: 3372: 3369: 3367: 3364: 3362: 3359: 3357: 3354: 3352: 3349: 3348: 3346: 3344: 3340: 3332: 3329: 3327: 3324: 3322: 3319: 3317: 3314: 3313: 3311: 3307: 3304: 3302: 3299: 3297: 3294: 3292: 3289: 3287: 3284: 3283: 3281: 3280: 3278: 3276: 3272: 3266: 3263: 3261: 3258: 3254: 3251: 3249: 3248:Washer method 3246: 3245: 3243: 3241: 3238: 3234: 3231: 3230: 3229: 3226: 3222: 3219: 3217: 3214: 3212: 3211:trigonometric 3209: 3208: 3207: 3204: 3202: 3199: 3195: 3192: 3191: 3190: 3187: 3185: 3182: 3180: 3177: 3175: 3172: 3170: 3167: 3165: 3162: 3161: 3159: 3157: 3153: 3145: 3142: 3140: 3137: 3135: 3132: 3131: 3130: 3127: 3123: 3120: 3118: 3115: 3114: 3112: 3108: 3105: 3103: 3100: 3098: 3095: 3093: 3090: 3089: 3088: 3085: 3081: 3080:Related rates 3078: 3076: 3073: 3071: 3068: 3066: 3063: 3062: 3060: 3056: 3053: 3049: 3046: 3045: 3044: 3041: 3039: 3036: 3034: 3031: 3029: 3026: 3024: 3021: 3019: 3016: 3015: 3014: 3011: 3007: 3004: 3002: 2999: 2998: 2997: 2994: 2992: 2989: 2987: 2984: 2982: 2979: 2977: 2974: 2972: 2969: 2967: 2964: 2963: 2961: 2959: 2955: 2949: 2946: 2944: 2941: 2939: 2936: 2932: 2929: 2928: 2927: 2924: 2922: 2919: 2918: 2916: 2914: 2910: 2904: 2901: 2899: 2896: 2894: 2891: 2889: 2886: 2884: 2881: 2879: 2876: 2874: 2871: 2869: 2866: 2864: 2861: 2859: 2856: 2854: 2851: 2849: 2846: 2844: 2841: 2840: 2838: 2836: 2832: 2828: 2821: 2816: 2814: 2809: 2807: 2802: 2801: 2798: 2790: 2786: 2782: 2778: 2774: 2770: 2766: 2762: 2758: 2754: 2750: 2746: 2742: 2736: 2732: 2728: 2724: 2720: 2716: 2715: 2710: 2706: 2702: 2698: 2697: 2687: 2683: 2679: 2673: 2669: 2664: 2660: 2656: 2652: 2646: 2642: 2637: 2636: 2630:, p. 33. 2629: 2628:Thompson 1991 2624: 2617: 2611: 2604: 2598: 2596: 2591: 2581: 2580:Scope (logic) 2578: 2576: 2573: 2571: 2568: 2566: 2563: 2561: 2558: 2556: 2553: 2552: 2546: 2544: 2540: 2536: 2531: 2525: 2521: 2518: 2512: 2506: 2503: 2499: 2495: 2492: 2486: 2479: 2478: 2477: 2475: 2471: 2464: 2462: 2457: 2456: 2455: 2452: 2450: 2446: 2442: 2438: 2434: 2426: 2422: 2418: 2414: 2413: 2412: 2410: 2406: 2398: 2394: 2391: 2385: 2378: 2375: 2371: 2367: 2364: 2358: 2352: 2351: 2350: 2348: 2347:ungrammatical 2344: 2340: 2336: 2332: 2328: 2324: 2320: 2316: 2309: 2307: 2302: 2301: 2300: 2298: 2294: 2290: 2286: 2282: 2278: 2270: 2266: 2263: 2257: 2250: 2247: 2243: 2239: 2236: 2230: 2224: 2223: 2222: 2219: 2217: 2213: 2211: 2204: 2200: 2198: 2191: 2187: 2183: 2181: 2174: 2172: 2161: 2157: 2154: 2148: 2142: 2139: 2135: 2131: 2128: 2122: 2116: 2115: 2114: 2112: 2108: 2104: 2100: 2096: 2092: 2088: 2084: 2080: 2076: 2072: 2068: 2061: 2059: 2054: 2053: 2052: 2050: 2046: 2042: 2038: 2034: 2030: 2019: 2016: 2001: 1998:December 2008 1992: 1988: 1985:This section 1983: 1980: 1976: 1975: 1966: 1963: 1955: 1945: 1941: 1937: 1931: 1930: 1926: 1921:This section 1919: 1915: 1910: 1909: 1904: 1902: 1895: 1894: 1889: 1888: 1883: 1878: 1869: 1868: 1860: 1858: 1854: 1851: 1847: 1828: 1822: 1816: 1813: 1810: 1800: 1783: 1777: 1773: 1743: 1739: 1732: 1723: 1719: 1711: 1710: 1709: 1689: 1685: 1678: 1675: 1672: 1668: 1660: 1659: 1658: 1656: 1652: 1648: 1644: 1639: 1636: 1632: 1625: 1620: 1616: 1609: 1605: 1601: 1581: 1577: 1566: 1562: 1558: 1555: 1552: 1547: 1543: 1535: 1531: 1528: 1521: 1520: 1519: 1511: 1509: 1504: 1502: 1496: 1442: 1437: 1435: 1431: 1427: 1423: 1419: 1416:, a location 1415: 1410: 1408: 1404: 1400: 1396: 1392: 1388: 1384: 1380: 1376: 1351: 1345: 1342: 1333: 1327: 1323: 1310: 1298: 1289: 1271: 1267: 1264: 1261: 1258: 1255: 1250: 1246: 1239: 1235: 1231: 1224: 1223: 1222: 1204: 1197: 1194: 1191: 1185: 1179: 1175: 1169: 1166: 1163: 1160: 1157: 1153: 1145: 1144: 1143: 1140: 1135: 1133: 1130:for some set 1129: 1125: 1106: 1098: 1088: 1082: 1072: 1069: 1065: 1055: 1051: 1043: 1040: 1037: 1033: 1025: 1022: 1019: 1015: 1007: 1006: 1005: 997: 995: 991: 972: 965:divisible by 950: 946: 923: 919: 915: 912: 907: 903: 882: 879: 876: 873: 853: 833: 825: 824: 823: 810: 801: 799: 795: 791: 787: 786:logical value 783: 779: 775: 771: 753: 740: 737: 734: 731: 728: 722: 709: 700: 690: 689: 688: 685: 683: 679: 675: 671: 653: 648: 641: 635: 632: 626: 623: 620: 614: 606: 600: 588: 587: 586: 583: 581: 577: 573: 569: 551: 548: 545: 539: 536: 532: 526: 523: 520: 516: 505: 501: 493: 492: 491: 488: 486: 482: 478: 474: 456: 450: 447: 444: 438: 433: 428: 425: 422: 418: 410: 409: 408: 405: 397: 395: 389: 387: 371: 351: 343: 324: 320: 314: 309: 306: 302: 297: 290: 280: 279: 278: 274: 271: 255: 247: 243: 239: 234: 232: 228: 224: 220: 216: 212: 207: 205: 201: 197: 193: 189: 185: 181: 180:free variable 177: 173: 172:free variable 169: 165: 164:real variable 161: 157: 153: 149: 138: 135: 127: 124:December 2008 116: 113: 109: 106: 102: 99: 95: 92: 88: 85: â€“  84: 80: 79:Find sources: 73: 69: 63: 62: 57:This article 55: 51: 46: 45: 40: 36: 29: 22: 3746:Secant cubed 3671: 3664: 3645:Isaac Newton 3615:Brook Taylor 3282:Derivatives 3253:Shell method 2981:Differential 2867: 2712: 2709:Leader, Imre 2667: 2640: 2623: 2615: 2610: 2602: 2570:Name binding 2532: 2529: 2523: 2516: 2510: 2507: 2501: 2497: 2490: 2484: 2481: 2473: 2469: 2468:the pronoun 2467: 2460: 2458: 2453: 2448: 2444: 2440: 2436: 2432: 2430: 2424: 2420: 2416: 2402: 2396: 2389: 2387:hurt herself 2383: 2380: 2373: 2369: 2362: 2360:hurt herself 2356: 2353: 2342: 2338: 2330: 2326: 2322: 2314: 2312: 2305: 2303: 2296: 2291:, etc., and 2288: 2284: 2280: 2274: 2268: 2261: 2255: 2252: 2245: 2241: 2234: 2228: 2225: 2220: 2215: 2209: 2206: 2202: 2196: 2193: 2179: 2176: 2170: 2167: 2165: 2159: 2152: 2146: 2143: 2137: 2133: 2126: 2120: 2117: 2110: 2106: 2102: 2098: 2090: 2078: 2074: 2066: 2064: 2057: 2055: 2048: 2044: 2040: 2026: 2011: 1995: 1991:adding to it 1986: 1958: 1949: 1934:Please help 1922: 1898: 1891: 1885: 1884:Please help 1881: 1856: 1852: 1764: 1707: 1642: 1640: 1634: 1630: 1623: 1618: 1614: 1607: 1603: 1599: 1597: 1517: 1507: 1505: 1497: 1463:and free in 1459:is bound in 1438: 1433: 1429: 1425: 1421: 1417: 1413: 1411: 1402: 1398: 1394: 1390: 1372: 1287: 1221:for sums or 1220: 1136: 1131: 1127: 1123: 1121: 1003: 993: 989: 987: 802: 797: 793: 789: 777: 773: 769: 768: 686: 681: 677: 673: 669: 668: 584: 579: 575: 571: 567: 566: 489: 484: 480: 476: 472: 471: 406: 403: 390: 385: 341: 339: 275: 269: 237: 235: 208: 195: 192:substitution 179: 175: 171: 167: 163: 154:, including 145: 130: 121: 111: 104: 97: 90: 78: 66:Please help 61:verification 58: 21:Name binding 3814:of surfaces 3565:and numbers 3527:Dirichlet's 3497:Telescoping 3450:Alternating 3038:L'HĂ´pital's 2835:Precalculus 2541:(see also: 2459:Ashley hit 2437:λx.x hurt x 2083:coreference 2056:Lisa found 1508:closed term 196:placeholder 148:mathematics 3866:Categories 3610:Adequality 3296:Divergence 3169:Arc length 2966:Derivative 2789:1242.00016 2757:2008020450 2749:j.ctt7sd01 2650:0201416670 2586:References 2319:antecedent 2304:Jane hurt 2297:each other 2295:, such as 2289:themselves 2279:, such as 1952:March 2023 1887:improve it 938:, we have 866:such that 227:parameters 217:used in a 188:expression 94:newspapers 3809:of curves 3804:Curvature 3691:Integrals 3485:Maclaurin 3465:Geometric 3356:Geometric 3306:Laplacian 3018:linearity 2858:Factorial 2781:19327100M 2773:227205932 2431:in which 2275:However, 2265:own book. 2259:found her 2238:own book. 2232:found her 2186:Norwegian 2150:found her 2124:found her 2095:pragmatic 1923:does not 1893:talk page 1814:∈ 1808:∀ 1774:∑ 1736:↦ 1720:∑ 1676:∈ 1669:∑ 1651:summation 1575:↦ 1556:… 1455:. We say 1449:M = λx. T 1407:semantics 1375:syntactic 1343:∨ 1321:∃ 1308:∀ 1243:↦ 1183:↦ 1164:… 1154:∑ 1139:operators 1104:∃ 1096:∀ 1086:→ 1066:⋯ 1061:∞ 1052:∫ 1041:∈ 1034:∏ 1023:∈ 1016:∑ 992:but also 988:not only 723:φ 707:∃ 698:∀ 633:− 604:→ 537:− 524:− 511:∞ 502:∫ 419:∑ 295:∃ 288:∀ 215:variables 3799:Manifold 3532:Integral 3475:Infinite 3470:Harmonic 3455:Binomial 3301:Gradient 3244:Volumes 3055:Quotient 2996:Notation 2827:Calculus 2659:23287456 2549:See also 2535:anaphors 2087:referent 2079:her book 895:. Since 400:Examples 246:universe 219:function 184:notation 3736:inverse 3724:inverse 3650:Fluxion 3460:Fourier 3326:Stokes' 3321:Green's 3043:Product 2903:Tangent 2765:2467561 2514:hit her 2488:hit her 2397:herself 2370:herself 2343:herself 2335:subject 2327:herself 2315:herself 2306:herself 2285:herself 2281:himself 2190:Swedish 1944:removed 1929:sources 1848:of the 1439:In the 108:scholar 3819:Tensor 3741:Secant 3507:Abel's 3490:Taylor 3381:Matrix 3331:Gauss' 2913:Limits 2893:Secant 2883:Radian 2787:  2779:  2771:  2763:  2755:  2747:  2737:  2684:  2674:  2657:  2647:  2508:Ashley 2502:Ashley 2482:Ashley 2216:hennes 1820:  1765:where 1598:where 713:  704:  200:symbol 190:where 110:  103:  96:  89:  81:  3683:Lists 3542:Ratio 3480:Power 3216:Euler 3033:Chain 3023:Power 2898:Slope 2745:JSTOR 2682:JSTOR 2447:with 2427:)Jane 2423:hurt 2244:= of 2156:book. 2136:= of 2130:book. 2071:refer 2060:book. 2039:like 2033:bound 1629:, …, 1613:, …, 1475:then 1473:λx. U 1467:. If 342:false 270:bound 238:bound 182:is a 115:JSTOR 101:books 3552:Term 3547:Root 3286:Curl 2769:OCLC 2753:LCCN 2735:ISBN 2672:ISBN 2655:OCLC 2645:ISBN 2449:JANE 2433:Jane 2381:Jane 2374:Jane 2354:Jane 2341:and 2339:Jane 2331:Jane 2323:Jane 2253:Lisa 2246:Lisa 2226:Lisa 2188:and 2175:and 2144:Lisa 2138:Lisa 2118:Lisa 2075:Lisa 2049:they 1927:any 1925:cite 1379:tree 826:Let 776:and 386:true 364:and 225:nor 174:and 170:for 166:and 158:and 87:news 3028:Sum 2785:Zbl 2727:doi 2545:). 2524:her 2498:her 2470:her 2461:her 2269:her 2242:her 2214:as 2207:her 2203:sin 2201:as 2194:her 2177:her 2168:her 2160:her 2134:her 2091:her 2089:of 2067:her 2058:her 2045:she 1993:. 1938:by 1643:the 1487:in 1079:lim 796:or 597:lim 244:or 209:In 198:(a 146:In 70:by 37:or 3868:: 2783:. 2777:OL 2775:. 2767:. 2761:MR 2759:. 2751:. 2743:. 2733:. 2721:: 2717:. 2707:; 2703:; 2680:. 2653:. 2594:^ 2500:= 2415:(λ 2372:= 2349:: 2287:, 2283:, 2218:. 2047:, 2043:, 2041:he 1896:. 1859:. 1638:. 1506:A 1495:. 1443:, 1436:. 1428:, 1401:, 1170:10 1134:. 434:10 2819:e 2812:t 2805:v 2791:. 2729:: 2688:. 2661:. 2520:. 2517:j 2511:i 2504:) 2494:. 2491:i 2485:i 2480:* 2463:. 2441:x 2425:x 2421:x 2419:. 2417:x 2393:. 2390:j 2384:i 2379:* 2376:) 2366:. 2363:i 2357:i 2308:. 2262:j 2256:i 2251:* 2248:) 2235:i 2229:i 2210:j 2197:i 2180:j 2171:i 2153:j 2147:i 2140:) 2127:i 2121:i 2107:i 2103:j 2099:i 2018:) 2012:( 2000:) 1996:( 1965:) 1959:( 1954:) 1950:( 1946:. 1932:. 1903:) 1899:( 1857:S 1853:P 1832:) 1829:x 1826:( 1823:P 1817:S 1811:x 1784:f 1778:S 1749:) 1744:2 1740:x 1733:x 1730:( 1724:S 1690:2 1686:x 1679:S 1673:x 1635:n 1631:x 1627:1 1624:x 1619:n 1615:x 1611:1 1608:x 1604:t 1600:t 1582:] 1578:t 1572:) 1567:n 1563:x 1559:, 1553:, 1548:1 1544:x 1540:( 1536:[ 1532:= 1529:f 1493:x 1489:U 1485:x 1481:x 1477:x 1469:T 1465:T 1461:M 1457:x 1453:T 1445:x 1434:n 1430:P 1426:v 1422:n 1418:a 1414:v 1403:P 1399:v 1395:P 1391:v 1358:) 1355:) 1352:z 1349:( 1346:B 1340:) 1337:) 1334:x 1331:( 1328:A 1324:y 1318:( 1315:( 1311:x 1272:) 1268:1 1265:+ 1262:x 1259:2 1256:+ 1251:2 1247:x 1240:x 1236:( 1232:D 1205:) 1201:) 1198:n 1195:, 1192:k 1189:( 1186:f 1180:k 1176:( 1167:, 1161:, 1158:1 1132:S 1128:x 1107:x 1099:x 1089:0 1083:x 1073:x 1070:d 1056:0 1044:S 1038:x 1026:S 1020:x 994:n 990:k 973:4 951:2 947:n 924:2 920:k 916:4 913:= 908:2 904:n 883:k 880:2 877:= 874:n 854:k 834:n 811:4 798:y 794:x 790:z 778:y 774:x 770:z 754:, 749:] 744:) 741:z 738:, 735:y 732:, 729:x 726:( 718:[ 710:y 701:x 682:h 678:x 674:h 670:x 654:, 649:h 645:) 642:x 639:( 636:f 630:) 627:h 624:+ 621:x 618:( 615:f 607:0 601:h 580:x 576:y 572:x 568:y 552:, 549:x 546:d 540:x 533:e 527:1 521:y 517:x 506:0 485:k 481:n 477:k 473:n 457:, 454:) 451:n 448:, 445:k 442:( 439:f 429:1 426:= 423:k 372:y 352:x 325:. 321:) 315:y 310:= 307:x 303:( 298:x 291:y 256:n 137:) 131:( 126:) 122:( 112:· 105:· 98:· 91:· 64:. 41:. 30:. 23:.

Index

Name binding
Free variables (system of linear equations)
Free parameter
Dummy variable (statistics)

verification
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"Free variables and bound variables"
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