Category Archives: People

The last paper of Catherine Rényi and Alfréd Rényi: Counting k-Trees

Posted on May 1, 2019 by

A k-tree is a graph obtained as follows: A clique with k vertices is a k-tree. A k-tree with n+1 vertices is obtained from a k-tree with n-vertices by adding a new vertex and connecting it to all vertices of a … Continue reading →

Posted in Combinatorics, People | Tagged , , | 7 Comments

The (Random) Matrix and more

Posted on April 21, 2019 by

Three pictures, and a few related links. Van Vu Spoiler: In one of the most intense scenes, the protagonist, with his bare hands and against all odds, took care of the mighty Wigner semi-circle law in two different ways. (From … Continue reading →

Posted in Combinatorics, People, What is Mathematics | Tagged , , , , , , | 1 Comment

My Copy of Branko Grünbaum’s Convex Polytopes

Posted on April 26, 2018 by

Branko Grünbaum is my academic grandfather (see this highly entertaining post for a picture representing five academic generations). Gunter Ziegler just wrote a beautiful article in the Notices of the AMS on Branko Grunbaum’s  classic book “Convex Polytopes”, so this … Continue reading →

Posted in Combinatorics, Convex polytopes, People | Tagged , , | 4 Comments

After-Dinner Speech for Alex Lubotzky

Posted on November 7, 2017 by

An after-dinner speech given on November  9, 2016*, on Alex Lubotzky’s 60th birthday conference: 60 faces to Groups.   As we all realized waking up this morning, today is a historic day*. It is the dinner day for Alex 60th‘s … Continue reading →

Posted in Conferences, People, personal | Tagged | Leave a comment