Blogs about: Combinatorics
Featured Blog
Gale and Koszul duality, together at last
So, in past posts, I’ve attempted to explain a bit about Gale duality and about Koszul duality, so now I feel like I should try to explain what they have to do with each other, since I (and so… more »
Secret Blogging Seminar
Gale and Koszul duality, together at last
— 2 comments
Ben Webster wrote 5 days ago: So, in past posts, I’ve attempted to explain a bit about Gale duality and about Koszul duality … more »
The Twenty-Seven Lines on the Cubic Surface
— 8 comments
Charles wrote 1 month ago: Ok, I just came across this proof, and it’s so cool I have to blog about it. This is not rela … more »
Update on 2-dimensional Kakeya sets over finite fields
JSE wrote 1 month ago: A few months ago I wrote about the problem of giving a sharp lower bound for the size of a Kakeya su … more »
Hypertoric varieties and Koszul duality
— 6 comments
Ben Webster wrote 3 months ago: So, on Wednesday, I gave a talk with the above title at IAS, about work in progress with Tom Braden, … more »
Give the people (who like the Kakeya problem) what they want
— 12 comments
JSE wrote 3 months ago: Wow — make one comment on Terry’s blog and you get a ton of traffic. Terry encouraged me … more »
Interpreting the Hecke Algebra
— 7 comments
davidspeyer wrote 4 months ago: Let denote the finite field with elements. Let denote the set of complete flags in . Such a flag … more »
Stable marriages
— 14 comments
Ben Webster wrote 6 months ago: So, one of my odd mathematical fixations (totally unrelated to my research) is the stable marriage a … more »
Embedded TQFT?
— 10 comments
Ben Webster wrote 6 months ago: So, a subject rather near and dear to the hearts of many of my fellow co-bloggers is that of 1+1-dim … more »
Counting combinations
pythonisms wrote 1 day ago: The number of ways to select r items from a set of size n where order matters is usually called: n p … more »
Cohen Macaulay Algebras and Non-negativity
— 1 comment
benbraun wrote 1 day ago: One element of topological and algebraic combinatorics that I found very difficult to understand as … more »
Extermal Combinatorics II: Some Geometry and Number Theory
Gil Kalai wrote 2 days ago: Extremal problems in additive number theory Our first lecture dealt with extremal problems for fam … more »
Counting and generating Permutations
pythonisms wrote 4 days ago: You may have seen puzzles where you have to arrange tiles in different orders. Consider 4 letters a, … more »
Pushing Behrend Around
Gil Kalai wrote 1 week ago: Erdos and Turan asked in 1936: What is the largest subset of {1,2,…,n} without a 3-term arit … more »
From Helly to Cayley IV: Probability
— 4 comments
Gil Kalai wrote 1 week ago: I decided to split long part III into two parts. This (truly) last part of this series deals with p … more »
Cedric's Coding Challenge
ragstorooks wrote 2 weeks ago: I thought I would take an attempt at the coding challenge presented by Cedric. Most of the solutions … more »
Helly, Cayley, Hypertrees, and Weighted Enumeration III
— 2 comments
Gil Kalai wrote 2 weeks ago: This is the third and last part of the journey from a Helly type conjecture of Katchalski and Perl … more »
Euler's Formula, Fibonacci, the Bayer-Billera Theorem, and Fine's CD-index
— 2 comments
Gil Kalai wrote 4 weeks ago: Bill Gessley proving Euler’s formula (at UMKC) In the earlier post about Billerafest I m … more »
Helly's Theorem, "Hypertrees", and Strange Enumeration II: The Formula
Gil Kalai wrote 1 month ago: In the first part of this post we discussed an appealing conjecture regaring an extension of Cayley … more »
Stirling Numbers of First Kind
Reetesh Mukul wrote 1 month ago: Vikalpa, is a Sanskrit/Hindi word, often used in context of choice making. The ancient Indian Script … more »
Have your say. Start a blog.
See our free features »
Copyright 2008 Automattic, Inc.
An 
Invention
