Algebra

Prime avoidance lemma

In algebra, the prime avoidance lemma says that if an ideal I in a commutative ring R is contained in a union of finitely many prime ideals Pi's, then it is contained in Pi for some i. There are many variations of the lemma (cf. Hochster); for example, if the ring R contains an infinite field or a finite field of sufficiently large cardinality, then the statement follows from a fact in linear algebra that a vector space over an infinite field or a finite field of large cardinality is not a finite union of its proper vector subspaces. (Wikipedia).

Video thumbnail

Regularity lemma and its applications Part I - Fan Wei

Computer Science/Discrete Mathematics Seminar II Topic: Regularity lemma and its applications Part I Speaker: Fan Wei Affiliation: Member, School of Mathematics Dater: December 3, 2019 For more video please visit http://video.ias.edu

From playlist Mathematics

Video thumbnail

Prime Numbers and their Mysterious Distribution (Prime Number Theorem)

Primes are the building blocks of math. But just how mysterious are they? Our study of prime numbers dates back to the ancient Greeks who first recognized that certain numbers can't be turned into rectangles, or that they can't be factored into any way. Over the years prime numbers have

From playlist Prime Numbers

Video thumbnail

How to find prime numbers #shorts

In this short we talk about finding prime numbers. Full video at https://youtu.be/CEyZRhi45pE

From playlist #shorts mathematicsonline

Video thumbnail

Theory of numbers: Gauss's lemma

This lecture is part of an online undergraduate course on the theory of numbers. We describe Gauss's lemma which gives a useful criterion for whether a number n is a quadratic residue of a prime p. We work it out explicitly for n = -1, 2 and 3, and as an application prove some cases of Di

From playlist Theory of numbers

Video thumbnail

Water and Wine

This course is on Lemma: http://lem.ma Lemma looking for developers: http://lem.ma/jobs Other than http://lem.ma, I recommend Strang http://bit.ly/StrangYT, Gelfand http://bit.ly/GelfandYT, and my short book of essays http://bit.ly/HALAYT Questions and comments below will be prompt

From playlist Problems, Paradoxes, and Sophisms

Video thumbnail

Prove that there is a prime number between n and n!

A simple number theory proof problem regarding prime number distribution: Prove that there is a prime number between n and n! Please Like, Share and Subscribe!

From playlist Elementary Number Theory

Video thumbnail

Number Theory | Divisibility Basics

We present some basics of divisibility from elementary number theory.

From playlist Divisibility and the Euclidean Algorithm

Video thumbnail

The Graph Removal Lemma - Jacob Fox

Jacob Fox Massachusetts Institute of Technology November 8, 2010 Let H be a fixed graph with h vertices. The graph removal lemma states that every graph on n vertices with o(nh) copies of H can be made H-free by removing o(n2) edges. We give a new proof which avoids Szemeredi's regularity

From playlist Mathematics

Video thumbnail

F. Schulze - An introduction to weak mean curvature flow 4 (version temporaire)

It has become clear in recent years that to understand mean curvature flow through singularities it is essential to work with weak solutions to mean curvature flow. We will give a brief introduction to smooth mean curvature flow and then discuss Brakke flows, their basic properties and how

From playlist Ecole d'été 2021 - Curvature Constraints and Spaces of Metrics

Video thumbnail

F. Schulze - An introduction to weak mean curvature flow 4

It has become clear in recent years that to understand mean curvature flow through singularities it is essential to work with weak solutions to mean curvature flow. We will give a brief introduction to smooth mean curvature flow and then discuss Brakke flows, their basic properties and how

From playlist Ecole d'été 2021 - Curvature Constraints and Spaces of Metrics

Video thumbnail

Commutative algebra 58: System of parameters versus Krull

This lecture is part of an online course on commutative algebra, following the book "Commutative algebra with a view toward algebraic geometry" by David Eisenbud. We show that the smallest size of a system of parameters of a Noetherian local ring is at most the Krull dimension. The proof

From playlist Commutative algebra

Video thumbnail

Log Volume Computations - part 0.2 - Total Rings Of Fractions

This is the second part of the prerequisite videos for the log volume computations and is optional for continuing. In this video we explain how to take rings of fractions for reduced but not irreducible rings. We then show that the ring of fractions of a tensor product is the tensor prod

From playlist Log Volume Computations

Video thumbnail

1,010,010,101,000,011 - #MegaFavNumbers

This is my submission to the #megafavnumbers project. My number is 1010010101000011, which is prime in bases 2, 3, 4, 5, 6 and 10. I've open-sourced my code: https://bitbucket.org/Bip901/multibase-primes Clarification: by "ignoring 1" I mean ignoring base 1, since this number cannot be fo

From playlist MegaFavNumbers

Video thumbnail

Bipartite perfect matching is in quasi-NC - Fenner

Computer Science/Discrete Mathematics Seminar I Topic: Bipartite perfect matching is in quasi-NC Speaker: Stephen Fenner Date:Monday, February 8 We show that the bipartite perfect matching problem is in quasi 𝖭𝖢2quasi-NC2. That is, it has uniform circuits of quasi-polynomial size and O(

From playlist Mathematics

Video thumbnail

The Erdos - Ginzburg - Ziv Constant by Wolfgang Schmid

Program Workshop on Additive Combinatorics ORGANIZERS: S. D. Adhikari and D. S. Ramana DATE: 24 February 2020 to 06 March 2020 VENUE: Madhava Lecture Hall, ICTS Bangalore Additive combinatorics is an active branch of mathematics that interfaces with combinatorics, number theory, ergod

From playlist Workshop on Additive Combinatorics 2020

Video thumbnail

(3.1.102) Solve a Basic System of Differential Equations (Substitution)

This video explains how to solve a system of differential equations by differentiating and performing substitution. https://mathispower4u.com

From playlist Differential Equations: Complete Set of Course Videos

Video thumbnail

Stanley-Wilf limits are typically exponential - Jacob Fox

Jacob Fox Massachusetts Institute of Technology October 7, 2013 For a permutation p, let Sn(p) be the number of permutations on n letters avoiding p. Stanley and Wilf conjectured that, for each permutation p, Sn(p)1/n tends to a finite limit L(p). Marcus and Tardos proved the Stanley-Wilf

From playlist Mathematics

Video thumbnail

Progress on algorithmic versions of the Lovasz Local Lemma - Aravind Srinivasan

Aravind Srinivasan University of Maryland, College Park April 7, 2014 There has been substantial progress on algorithmic versions and generalizations of the Lovasz Local Lemma recently, with some of the main ideas getting simplified as well. I will survey some of the main ideas of Moser &

From playlist Mathematics

Video thumbnail

Press ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff

In this video, I find a couple of solutions of the differential equation f' = fffffffffffffffffffffffffffffff... Some of them are not surprising, but one of them is really surprising!!! Can you find other solutions? Let me know in the comments! Enjoy! Subscribe to my channel: https://www

From playlist Random fun

Video thumbnail

Hugo Duminil-Copin - 3/4 The Self-Avoiding Walk Model

The course will focus on rigorous results for the self-avoiding walk model on lattices, with a special emphasis on low-dimensional ones. The model is defined by choosing uniformly at random among random walk paths starting from the origin and without self-intersections. Despite its simple

From playlist Hugo Duminil-Copin - The Self-Avoiding Walk Model

Related pages

Prime ideal | Vector space | Linear algebra | Regular sequence | Field (mathematics) | Union (set theory) | Algebra | Commutative ring