133:
Tanner, R. C. H. (March 1980a), "The
Ordered Regiment of the Minus Sign: Off-Beat Mathematics in Harriot's Manuscripts",
113:
Peterson, John C. (May 1972), "Fourteen different strategies for multiplication of integers or why (⁻1) (⁻1) = ⁺1",
93:
Arcavi, Abraham; Bruckheimer, Maxim (November 1981), "How Shall We Teach the
Multiplication of Negative Numbers?",
176:
153:
Tanner, R. C. H. (March 1980b), "The Alien Realm of the Minus: Deviatory
Mathematics in Cardano's Writings",
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considered alternate versions of multiplication in which minus times minus equals minus.
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177:Category:Elementary arithmetic
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41:positive and negative numbers
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167:10.1080/00033798000200171
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174:Category:Multiplication
115:The Arithmetic Teacher
95:Mathematics in School
155:Annals of Science
135:Annals of Science
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127:10.2307/41188049
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51:Girolamo Cardano
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47:Thomas Harriot
37:multiplication
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33:law of signs
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29:mathematics
57:References
35:governs
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