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共 299 个问题,第 5/15 页
数论 MSE -1 票 0 回答 33 浏览 未读

Combinatorics applications to energy engineering?

Kadin Shah
My name is Kadin Shah, and I am a rising senior at Arizona State University studying Applied Mathematics with an emphasis in mechanical engineering. I'm interested in using creative problem-solving solutions in a collaborative setting with engineers at a large company such as a National...
代数数论 MSE -3 票 0 回答 66 浏览 未读

Where can I find the detailed definition of $\mathbb{Z}_p$ as projective limit?

LetteredBunny
I am doing my MSc project on "p-adic numbers". In my first chapter of the project, I want to include the construction of $\mathbb{Z}_p$ with both algebraic and analytic approach. But I'm not able to find any detailed explanation of analytic approach i.e.,...
代数数论 MSE 0 票 1 回答 83 浏览 未读

How does the prime (3) ramify in the extension?

pera erdir
I extend $\mathbb Q$ to first adjoin the roots of $x^2-1=9$ and then the roots of $(x^2-1)^2-1=9$, i.e. $x^4-2x^2-9=0$. In the second extension, I have to determine whether the prime ideal $(3)$ ramifies. I use the Newton Polygon to only deduce that $1$ determines the ramification index, which...
数论 MSE -2 票 0 回答 57 浏览 未读

Seeking Guidance for Pure Mathematics

Rishi Rao
I had currently passed 10th grade. I want to go in pure mathematics and research and publish paper in that field (especially Number Theory) please tell me roadmap and the books to follow one after one. Please Guide me.
数论 MSE 0 票 1 回答 57 浏览 未读

Does OEIS sequence A252502 contain all even numbers which are totients and all odd numbers $n$ with $n-1$ totients?

Richard Chen
For even number $n$, if $n$ is not a totient (i.e. not in the range of Euler totient function), then $n$ is not in OEIS sequence A252502, but if $n$ is a totient, must be $n$ in A252502? For odd number $n$, if $n-1$ is not a totient (i.e. not in the range of Euler totient function), then $n$ is...
数论 MSE 2 票 0 回答 56 浏览 未读

Problem Similar to Erdős Problem 252

lifeismathematics
Erdős Problem 252:(https://www.erdosproblems.com/252) Let $k\geqslant 1$ and $\sigma_{k}(n):= \sum_{d|n} d^{k}$. Is $\displaystyle \sum_{n=1}^{\infty} \frac{\sigma_{k}(n)}{n!}$ irrational? Currently this problem is open for $k \geqslant 5$. I am considering a different version of this problem...
解析数论 MSE 3 票 0 回答 62 浏览 未读

Which cases of Dirichlet's theorem on arithmetic progressions can be proved without analytic tools?

vagrant
I know that Schur and Murty proved that an Euclidean proof (hence a "non-analytic" proof) for the existence of infinite primes $p \equiv \ell \mod q$ with $q$ and $\ell$ coprime can be given if and only if $\ell^2 \equiv 1 \mod q$. Are there any cases where $\ell^2 \not\equiv 1 \mod q$, but we...
数论 MSE 2 票 0 回答 59 浏览 未读

Conjecture: A binomial sum congruence for Fibonacci

Nilotpal Kanti Sinha
In this related question, @Gerry Myerson asked if the conjecture fails for composites. Upon examining for composites, I found a pattern for module $n^2$ instead of $n^3$ in the linked original question. I have verified these conjectures for $n \le 5 \times 10^6$. Can they be proved or disproved....
代数几何 MSE 1 票 0 回答 40 浏览 未读

On complete intersections and transversality at a point?

Turbo
Let $F_1,F_2$ be degree $1$ and $F_3$ be degree $2$ in $\mathbb Z[x_1,\dots,x_4]$. Let there be an unique common integer to $F_i$. Let them be algebraically independent of a fourth polynomial $G$ which also has the same common integer root. Is it possible for the system to not form a complete...
解析数论 MSE 1 票 0 回答 73 浏览 未读

Is the Riemann Zeta function Is encoded in the triangle inequality?

Nilotpal Kanti Sinha
I had posted this question in MO that has remained unanswered in MO for more than two years now. While working on it, I accidently found an unexpected result. Let $0<x\leq y\leq z$ be the ordered side lengths of the triangle determined by three independent uniformly distributed points on a...
伽罗瓦理论 MSE -1 票 0 回答 81 浏览 未读

Are there structural alternatives to Cardano’s radical formula for general cubic equations?

Azad Azərbaycan
It is a classical result that the roots of a general cubic polynomial $x^3 + ax^2 + bx + c = 0$ can be expressed via Cardano’s formula using radicals of the form: $$x=\sqrt[3]u+\sqrt[3]v+k$$ where $u$ and $v$ depend on the coefficients and the discriminant $\Delta$. ​I am curious about the...
数论 MSE 2 票 0 回答 59 浏览 未读

Conjecture: Binomial sum congruence on Fibonacci and prime numbers

Nilotpal Kanti Sinha
My experimental data suggests that the following binomial sum congruence involving primes and Fibonacci numbers hold. I have experimentally verified them for all primes $\le 1.5 \times 10^6$. Can they be proved or disproved? Conjecture 1. Let $p$ be a prime, $ p\equiv 1 \text{ or } 19 \pmod{30}....
数论 MSE 3 票 0 回答 65 浏览 未读

Does $x_1^8+x_2^8+x_3^8+x_4^4 = y_1^8+y_2^8+y_3^8+y_4^4$ have infinitely many solutions?

Tito Piezas III
I. Question Consider the following independent and symmetric mixed equations, $\quad x_1^8+x_2^8+x_3^4 = y_1^8+y_2^8+y_3^4$ $\quad x_1^8+x_2^8+x_3^4+x_4^4 = y_1^8+y_2^8+y_3^4+y_4^4$ $\quad x_1^8+x_2^8+x_3^8+x_4^4 = y_1^8+y_2^8+y_3^8+y_4^4$ $\quad x_1^8+x_2^8+x_3^8+x_4^8+x_5^4 =...
数论 MSE 5 票 1 回答 65 浏览 已读

If $(a,b,c)$ is a primitive Pythagorean triple and $(ab)^2+c^2$ is a square, must $|a-b|=1$?

Gran Zoy
Let (a,b,c) be positive integers satisfying $a^2+b^2=c^2 \text{ and } \gcd(a,b,c)=1.$ I came up with the following problem about two years ago and have not been able to prove or disprove it. Is it true that $(ab)^2+c^2$ is a perfect square if and only if $|a-b|=1$? The reverse implication is...
代数几何 MSE 1 票 0 回答 35 浏览 未读

Natural filtration of Schur functor

GillThunder
Let $$ 0 \longrightarrow A \longrightarrow B \longrightarrow C \longrightarrow 0 $$ be a short exact sequence of vector bundles. It is well known that for exterior powers there exists a natural filtration $$ 0=F_{r+1}\subset F_r\subset \cdots \subset F_0=\bigwedge^r B $$ such that $$...
数论 MSE 0 票 0 回答 43 浏览 未读

Non-trivial solutions to $x^4 - Ny^4 = 1$ where $N = a^4 + b^4 + c^4$

MengMath
I am investigating the Diophantine equation $$x^4 - Ny^4 = 1$$ where $N$ can be expressed as a sum of three fourth powers: $$N = a^4 + b^4 + c^4$$ for integers $a, b, c$. Background: I see some from $\mathrm{A356496}$ for squarefree integers $k$ such that $x^4 - ky^2 = 1$ has a nontrivial...
数论 MSE 2 票 0 回答 31 浏览 未读

Primes as $X-Y$ with $\gcd(X,Y)=1$ and $\operatorname{rad}(XY)$ equal to the product of all primes below $p$ — is this known?

Matthew Miller
Title: Primes as $X-Y$ with $\gcd(X,Y)=1$ and $\operatorname{rad}(XY)$ equal to the product of all primes below $p$ — is this known? While experimenting with multiplicative decompositions of primes, I arrived at the following question. I would like to know whether it is already in the...
代数几何 MSE 0 票 0 回答 26 浏览 未读

reduction of a conjugate point in $X_0(p)$

Camilo Gallardo
Consider a non-cuspidal point $x\in X_0(p)(K)$ representing an elliptic curve $E/K$ over a quadratic field $K$, and suppose that $E$ has potentially multiplicative reduction over a prime $\mathfrak{q}$ of $K$ over the rational prime $q$. Let $0,\infty$ be the cusps of $X_0(p)$. Using the...
代数几何 MSE 2 票 1 回答 34 浏览 未读

Defining property of morphisms of algebraic spaces out of an &#233;tale local on source and target property of scheme morphisms. Stacks Project vs Olsson

El&#237;as Guisado Villalgordo
This is about the umpteenth discrepancy of definitions in algebraic geometry. It's about recipes to define properties of morphisms of algebraic spaces out of properties of morphisms of schemes. When the morphism of algebraic spaces in question is representable the recipe is clear [SP, 025V;...
代数几何 MSE -1 票 0 回答 34 浏览 未读

Irreducible topological space

Lars
We say that a topological space $X$ is irreducible if it can not be written as the union of two proper closed subsets. My question is: Do we consider this definition when the topological space is defined in terms of open subsets or closed subsets? When working with the zariski topology, the...