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On certain determinants and the square root of some determinants involving Legendre Symbols

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arxiv 2407.04556 v2 pith:MZIJWSQ6 submitted 2024-07-05 math.NT

On certain determinants and the square root of some determinants involving Legendre Symbols

classification math.NT
keywords leftrightsomedeterminantsfracintegerlegendreleqslant
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Let $p>3$ be a prime and $(\frac{.}{p})$ be the Legendre symbol. For any integer $d$ with $p\nmid d$ and any positive integer $m$, Sun introduced the determinants $$T_m(d,p)=\det\left[(i^2+dj^2)^m\left(\frac{i^2+dj^2}{p}\right)\right]_{1\leqslant i,j \leqslant (p-1)/2},$$ and $$D_p^{(m)}= \det\left[(i^2-j^2)^m\left(\frac{i^2-j^2}{p}\right)\right]_{1\leq i,j\leq (p-1)/2} .$$ In this paper, we obtain some properties of $T_m (d,p)$ and $ \sqrt{D_p^{(m)}}$ for some $m$. We also confirm some related conjectures posed by Zhi-Wei Sun.

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  1. A Pfaffian Proof and Generalization of a Conjecture of Sun Zhiwei

    math.NT 2026-07 unverdicted novelty 6.0

    Proves D_a(0)=0 iff p≡3 mod 4 and χ(a n!)=1, gives Pfaffian-square factorizations of the determinants for p≡3 mod 4, and settles Sun's conjecture when a=n!.