- Mathematical Gymnastics
- Media Item from “Haaretz” Today: “For the first time ever…”
- Jim Geelen, Bert Gerards, and Geoﬀ Whittle Solved Rota’s Conjecture on Matroids
- Media items on David, Amnon, and Nathan
- Next Week in Jerusalem: Special Day on Quantum PCP, Quantum Codes, Simplicial Complexes and Locally Testable Codes
- Happy Birthday Ervin, János, Péter, and Zoli!
- My Mathematical Dialogue with Jürgen Eckhoff
- Test Your Intuition (23): How Many Women?
- Happy Birthday Richard Stanley!
Top Posts & Pages
- Believing that the Earth is Round When it Matters
- The Kadison-Singer Conjecture has beed Proved by Adam Marcus, Dan Spielman, and Nikhil Srivastava
- Why Quantum Computers Cannot Work: The Movie!
- The Ultimate Riddle
- Two Math Riddles
- Mathematical Gymnastics
- New Ramanujan Graphs!
- Amazing: Peter Keevash Constructed General Steiner Systems and Designs
- Answer: Lord Kelvin, The Age of the Earth, and the Age of the Sun
Monthly Archives: May 2008
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
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
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
It was my first day as a postdoc at MIT, and after landing at Logan Airport I took a taxi to a relative in Beverly, north of Boston, where I was going to stay for a few days while looking for a … Continue reading
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
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
1. The “Center for Rationality” “Founded in 1991, the Hebrew University’s Center for the Study of Rationality [at first it was simply called "Center for Rationality"] is a unique venture in which faculty, students, and guests join forces to explore the … Continue reading
“The fixed price to JFK is 28 dollars” said the taxi driver; “toll and tips not included, and I want the two dollars and seventy five cents for the toll upfront.” I reached to my wallet, dug eleven quarters and … Continue reading
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