A simple proof of Jacobi's four-square theorem
M. D. Hirschhorn
Proc. Amer. Math. Soc. 101 (1987), 436-438
Primary 11P57; Secondary 05A17, 11E25
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Abstract: Jacobi's four-square theorem, which gives the number of representations of a positive integer as a sum of four squares, is shown to follow simply from the triple-product identity.
- G. H. Hardy and E. M. Wright, An introduction to the theory of numbers, 4th ed., Clarendon Press, Oxford.
- Michael D. Hirschhorn, A simple proof of Jacobi's two-square theorem, Amer. Math. Monthly 92 (1985), 579-580. MR 812102 (86m:11074)
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