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- Answer: Lord Kelvin, The Age of the Earth, and the Age of the Sun
- Three Conferences: Joel Spencer, April 29-30, Courant; Joel Hass May 20-22, Berkeley, Jean Bourgain May 21-24, IAS, Princeton
- Seven Problems Around Tverberg's Theorem
- Aaronson and Arkhipov's Result on Hierarchy Collapse
- Rodica Simion: Immigrant Complex
- Amazing: Peter Keevash Constructed General Steiner Systems and Designs

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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) follow-ups 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
3 Comments

## Jerusalem Combinatorics ’93

Jerusalem Combinatorics ’93 is the title of a conference I organized that took place fifteen years ago in May 9-17, 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 d-polytope has at least non empty faces. 2. The cube-simplex conjecture For every k there is f(k) so that every d-polytope with has a k-dimensional face which is either a simplex … Continue reading

## A Meeting at Marburg

Just returning from a cozy two days discrete-math 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