The recent exciting results by Bhargava, Conway, Hanke, Kaplansky, Rouse, and Schneeberger concerning the representabiltity of integers by positive integral quadratic forms in any number of variables are presented. These results build on the earlier work of Dickson, Halmos, Ramanujan, and Willerding on quadratic forms. Two results of this type for positive diagonal ternary forms are proved. These are the "four integers" and "five integers" theorems of the title.

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Journal American Mathematical Monthly
Williams, K.S. (2015). A "four integers" theorem and a "five integers" theorem. American Mathematical Monthly, 122(6), 528–536. doi:10.4169/amer.math.monthly.122.6.528