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Let $p>3$ be a prime. Gauss first introduced the polynomial $S_p(x)=prod_{c}(x-zeta_p^c),$ where $0<c<p$ and $c$ varies over all quadratic residues modulo $p$ and $zeta_p=e^{2pi i/p}$. Later Dirichlet investigated this polynomial and used this to solve the problems involving the Pell equations. Recently, Z.-W Sun studied some trigonometric identities involving this polynomial. In this paper, we generalized their results. As applications of our result, we extend S. Chowlas result on the congruence concerning the fundamental unit of $mathbb{Q}(sqrt{p})$ and give an equivalent form of the extended Ankeny-Artin-Chowla conjecture.
Let $c_1(x),c_2(x),f_1(x),f_2(x)$ be polynomials with rational coefficients. With obvious exceptions, there can be at most finitely many roots of unity among the zeros of the polynomials $c_1(x)f_1(x)^n+c_2(x)f_2(x)^n$ with $n=1,2ldots$. We estimate
Motivated by questions in number theory, Myerson asked how small the sum of 5 complex nth roots of unity can be. We obtain a uniform bound of O(n^{-4/3}) by perturbing the vertices of a regular pentagon, improving to O(n^{-7/3}) infinitely often. T
In 2007, G.E. Andrews introduced the $(n+1)$-variable combinatorial generating function $R_n(x_1,x_2,cdots,x_n;q)$ for ranks of $n$-marked Durfee symbols, an $(n+1)$-dimensional multisum, as a vast generalization to the ordinary two-variable partitio
Understanding the relationship between mock modular forms and quantum modular forms is a problem of current interest. Both mock and quantum modular forms exhibit modular-like transformation properties under suitable subgroups of $rm{SL}_2(mathbb Z)$,
Let $L/K$ be a quadratic extension of global fields. We study Cohen-Lenstra heuristics for the $ell$-part of the relative class group $G_{L/K} := textrm{Cl}(L/K)$ when $K$ contains $ell^n$th roots of unity. While the moments of a conjectural distribu