A determinant involving Ramanujan sums and So’s conjecture

نویسندگان

چکیده

Abstract We compute the determinant of a matrix containing Ramanujan sums associated to divisors an integer n , and use this computation prove weak version So’s conjecture on circulant graphs with integral spectrum.

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ژورنال

عنوان ژورنال: Archiv der Mathematik

سال: 2021

ISSN: ['0003-889X', '1420-8938']

DOI: https://doi.org/10.1007/s00013-021-01643-8