Monthly Archives: February 2017

Thilo Weinert: Transfinite Ramsey Numbers

Posted on February 28, 2017 by Gil Kalai

This is first of three posts kindly written by Thilo Weinert Recently Gil asked me whether I would like to contribute to his blog and I am happy to do so. I enjoy both finite and infinite combinatorics and it … Continue reading →

Posted in Combinatorics, Guest blogger, Logic and set theory | Tagged | 3 Comments

Timothy Chow Launched Polymath12 on Rota Basis Conjecture and Other News

Posted on February 26, 2017 by Gil Kalai

Polymath12 Timothy Chow launched polymath12 devoted to the Rota Basis conjecture on the polymathblog. A classic paper on the subject is the 1989 paper by Rosa Huang and Gian Carlo-Rota. Let me mention a strong version of Rota’s conjecture (Conjecture … Continue reading →

Posted in Combinatorics, Mathematics over the Internet, Movies, Music, Sport, Updates | Tagged | 2 Comments

Proof By Lice!

Posted on February 19, 2017 by Gil Kalai

From camels to lice. (A proof promised here.) Theorem (Hopf and Pannwitz, 1934): Let be a set of points in the plane  in general position (no three points on a line) and consider line segments whose endpoints are in .  Then … Continue reading →

Posted in Combinatorics, What is Mathematics | Tagged | 8 Comments

The seventeen camels riddle, and Noga Alon’s camel proof and algorithms

Posted on February 16, 2017 by Gil Kalai

Three children inherited 17 camels. The will gave one half to one child, one third to a second child and one ninth to the third. The children did not know what to do and  a neighbor offered to lend them … Continue reading →

Posted in Combinatorics | Tagged | 7 Comments

Edmund Landau and the Early Days of the Hebrew University of Jerusalem

Posted on February 2, 2017 by Gil Kalai

Some personal/historical remarks in  first minutes of my lecture at 7ECM on July 2016… German-Jewish mathematicians in the early days of the Hebrew University of Jerusalem Being invited to give a plenary lecture at the 7ECM was a great honor … Continue reading →

Posted in Academics, Combinatorics, personal | Tagged | 6 Comments