When are two Dedekind sums equal?

Details When are two Dedekind sums equal? When are two Dedekind sums equal?

2011-03-02

arxiv.org/abs/1103.0370v4

Mathematics

Number Theory

6 pages

Scientific paper

A natural question about Dedekind sums is to find conditions on the integers $a_1, a_2$, and $b$ such that $s(a_1,b) = s(a_2, b)$. We prove that if the former equality holds then $ b \ | \ (a_1a_2-1)(a_1-a_2)$. Surprisingly, to the best of our knowledge such statements have not appeared in the literature. A similar theorem is proved for the more general Dedekind-Rademacher sums as well, namely that for any fixed non-negative integer $n$, a positive integer modulus $b$, and two integers $a_1$ and $a_2$ that are relatively prime to $b$, the hypothesis $r_n (a_1,b)= r_n (a_2,b)$ implies that $b \ | \ (6n^2+1-a_1a_2)(a_2-a_1)$.

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