Nulton and Stolarsky [1] studied the first (i.e., the least positive)sign change of a real cosine polynomial as a function of its smallest frequency.In the present article we will study this problem further, especially to point out that their fundamental proposition is not correct, and that therefore their principal hypothesis is unreasonable. Moreover, various results of Nulton and Stolarsky are improved or corrected and two open questions set in their paper are solved.

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Keywords Classnumber, Quadratic fields, Reciprocity
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Journal Proceedings of the American Mathematical Society
Williams, K.S. (1991). On Yamamoto′s reciprocity law. Proceedings of the American Mathematical Society, 111(3), 607–609. doi:10.1090/S0002-9939-1991-1047009-X