Tag Archives: Lou Billera

Karim Adiprasito: The g-Conjecture for Vertex Decomposible Spheres

Posted on February 23, 2019 by Gil Kalai

J Scott Provan (site) The following post was kindly contributed by Karim Adiprasito. (Here is the link to Karim’s paper.) Update: See Karim’s comment on the needed ideas for extend the proof to the general case. See also  in the … Continue reading →

Posted in Combinatorics, Convex polytopes, Geometry, Guest blogger | Tagged , , , , | 9 Comments

Beyond the g-conjecture – algebraic combinatorics of cellular spaces I

Posted on June 20, 2018 by Gil Kalai

The g-conjecture for spheres is surely the one single conjecture I worked on more than on any other, and also here on the blog we had a sequence of posts about it by Eran Nevo (I,II,III,IV). Here is a great … Continue reading →

Posted in Combinatorics, Convex polytopes, Geometry | Tagged , , , , , , , , , , , , , , , , , , | 16 Comments

(Eran Nevo) The g-Conjecture I

Posted on April 2, 2009 by Gil Kalai

This post is authored by Eran Nevo. (It is the first in a series of five posts.) Peter McMullen The g-conjecture What are the possible face numbers of triangulations of spheres? There is only one zero-dimensional sphere and it consists … Continue reading →

Posted in Combinatorics, Convex polytopes, Guest blogger, Open problems | Tagged , , , , , , , | 13 Comments

Euler’s Formula, Fibonacci, the Bayer-Billera Theorem, and Fine’s CD-index

Posted on June 22, 2008 by Gil Kalai

Bill Gessley proving Euler’s formula (at UMKC) In the earlier post about Billerafest I mentioned the theorem of Bayer and Billera on flag numbers of polytopes. Let me say a little more about it. 1. Euler Euler’s theorem asserts that for … Continue reading →

Posted in Combinatorics, Convex polytopes | Tagged , , , , , | 8 Comments

Billerafest

Posted on June 12, 2008 by Gil Kalai

I am unable to attend the conference taking place now at Cornell, but I send my warmest greetings to Lou from Jerusalem. The titles and abstracts of the lectures can be found here. Let me tell you about two theorems by Lou. … Continue reading →

Posted in Conferences, Convex polytopes | Tagged , , , | 1 Comment