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In this paper, we study the generalized Lebesgue-Nagell equation [ x^2+7^{2k+1}=y^n. ] This is the last case of equations of the form $x^2+q^{2k+1}=y^n$ with $kgeq0$ and $q>0$ where $mathbb{Q}(sqrt{-q})$ has class number one. Our proof is based on the modular method and the symplectic argument.
It is well-known that for $p=1, 2, 3, 7, 11, 19, 43, 67, 163$, the class number of $mathbb{Q}(sqrt{-p})$ is one. We use this fact to determine all the solutions of $x^2+p^m=4y^n$ in non-negative integers $x, y, m$ and $n$.
Let $n$ be a positive integer. In 1915, Theisinger proved that if $nge 2$, then the $n$-th harmonic sum $sum_{k=1}^nfrac{1}{k}$ is not an integer. Let $a$ and $b$ be positive integers. In 1923, Nagell extended Theisingers theorem by showing that the
We introduce Galois families of modular forms. They are a new kind of family coming from Galois representations of the absolute Galois groups of rational function fields over the rational field. We exhibit some examples and provide an infinite Galois
For every normalized newform f in S_2(Gamma_1(N)) with complex multiplication, we study the modular parametrizations of elliptic curves C from the abelian variety A_f. We apply the results obtained when C is Grosss elliptic curve A(p).
A semiclassical approximation approach based on the Maslov complex germ method is considered in detail for the 1D nonlocal Fisher-Kolmogorov-Petrovskii-Piskunov equation under the supposition of weak diffusion. In terms of the semiclassical formalism