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Recent Posts
 Polymath 10 post 6: The ErdosRado sunflower conjecture, and the Turan (4,3) problem: homological approaches.
 Polymath 10 Emergency Post 5: The ErdosSzemeredi Sunflower Conjecture is Now Proven.
 Mind Boggling: Following the work of Croot, Lev, and Pach, Jordan Ellenberg settled the cap set problem!
 More Math from Facebook
 The Erdős Szekeres polygon problem – Solved asymptotically by Andrew Suk.
 The Quantum Computer Puzzle @ Notices of the AMS
 Three Conferences: Joel Spencer, April 2930, Courant; Joel Hass May 2022, Berkeley, Jean Bourgain May 2124, IAS, Princeton
 Math and Physics Activities at HUJI
 Stefan Steinerberger: The Ulam Sequence
Top Posts & Pages
 Polymath 10 Emergency Post 5: The ErdosSzemeredi Sunflower Conjecture is Now Proven.
 The Erdős Szekeres polygon problem  Solved asymptotically by Andrew Suk.
 Mind Boggling: Following the work of Croot, Lev, and Pach, Jordan Ellenberg settled the cap set problem!
 A Breakthrough by Maryna Viazovska Leading to the Long Awaited Solutions for the Densest Packing Problem in Dimensions 8 and 24
 Answer: Lord Kelvin, The Age of the Earth, and the Age of the Sun
 When It Rains It Pours
 Amazing: Peter Keevash Constructed General Steiner Systems and Designs
 Telling a Simple Polytope From its Graph
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Monthly Archives: May 2008
Is More Sex Safe? A book review.
I was asked by the Notices of the AMS to review the book “More Sex is Safe Sex: The Unconventional Wisdom of Econmics” by Steven E. Landsburg. My review entitled “Economics and Common Sense”, will appeared in the June/July issue of the Notices and … Continue reading
Posted in Book review, Economics
Tagged Book review, Economics, Malka Heller, Rationality, Sex, Steven Landsburg
11 Comments
Nati’s Influence
When do we say that one event causes another? Causality is a topic of great interest in statistics, physics, philosophy, law, economics, and many other places. Now, if causality is not complicated enough, we can ask what is the influence one event has … Continue reading
Is Mathematics a Science?
Many people do not regard mathematics as a science since it does not directly probe our physical reality; some mathematicians even like to think about mathematics as being closer to art, music or literature. But is there really a big … Continue reading
Posted in Open discussion, Philosophy, What is Mathematics
Tagged Mathematics, Philosophy of science
5 Comments
Local Events, Turan’s Problem and Limits of Graphs and Hypergraphs
I will write a little about how hectic things are now here at HU, and make two (somewhat related) followups on previous posts: Tell you about Turan’s problem, and about Balázs Szegedi’s lecture from Marburg dealing with limits of graphs and hypergraphs. Local Events … Continue reading
Posted in Combinatorics, Open problems
Tagged Extremal combinatorics, Graph limits, Quasirandomness, Turan's problem
4 Comments
Jerusalem Combinatorics ’93
Jerusalem Combinatorics ’93 is the title of a conference I organized that took place fifteen years ago in May 917, 1993 at the Hebrew University of Jerusalem. It was a conference that was devoted to all areas of combinatorics. The other … Continue reading
Posted in Combinatorics, Conferences, Women in science
Tagged Combinatorics, Conferences, Jerusalem, Women in science
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Five Open Problems Regarding Convex Polytopes
The problems 1. The conjecture A centrally symmetric dpolytope has at least non empty faces. 2. The cubesimplex conjecture For every k there is f(k) so that every dpolytope with has a kdimensional face which is either a simplex … Continue reading
A Meeting at Marburg
Just returning from a cozy two days discretemath workshop in Marburg. A very nice mixture of participants and topics. The title of my talk was “Helly theorem, hypertrees and strange enumeration” and I plan to blog about it sometime soon. A few hours before … Continue reading