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Proof of three conjectures on determinants related to quadratic residues
Journal article   Open access   Peer reviewed

Proof of three conjectures on determinants related to quadratic residues

Darij Grinberg, Zhi-Wei Sun and Lilu Zhao
Linear & multilinear algebra, v ahead-of-print(ahead-of-print), pp 1-13
01 Dec 2020
url
http://arxiv.org/abs/2007.06453View
Submitted Open

Abstract

Mathematics Physical Sciences Science & Technology
In this paper we confirm three conjectures of Z.-W. Sun on determinants. We first show that any odd integer n> 3 divides the determinant vertical bar(i(2) + dj(2)) (i(2) + dj(2)/n)vertical bar(0 <= i,j <=(n-1)/2), where d is any integer and (center dot/n) is the Jacobi symbol. Then we prove some divisibility results concerning vertical bar(i + dj)(n)vertical bar(0 <= i,j <= n-1) and vertical bar(i(2) + dj(2))(n)vertical bar(0 <= i,j <= n-1), where d not equal 0 and n> 2 are integers. Finally, for any odd prime p and integers c and d with p inverted iota cd, we determine completely the Legendre symbol (S-c(d,p)/p), where S-c(d, p) := vertical bar(i(2)+dj(2)+c/p)vertical bar(1 <= i,j <=(p-1)/2).

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