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 Reflections: On the Occasion of Ron Adin’s and Yuval Roichman’s Birthdays, and FPSAC 2021
 ICM 2018 Rio (5) Assaf Naor, Geordie Williamson and Christian Lubich
 Test your intuition 47: AGCGTCTGCGTCTGCGACGATC? what comes next in the sequence?
 Cheerful news in difficult times: Richard Stanley wins the Steele Prize for lifetime achievement!
 Combinatorial Theory is Born
 To cheer you up in difficult times 34: Ringel Circle Problem solved by James Davies, Chaya Keller, Linda Kleist, Shakhar Smorodinsky, and Bartosz Walczak
 Good Codes papers are on the arXiv
 To cheer you up in difficult times 33: Deep learning leads to progress in knot theory and on the conjecture that KazhdanLusztig polynomials are combinatorial.
 The Logarithmic Minkowski Problem
Top Posts & Pages
 NavierStokes Fluid Computers
 The Intermediate Value Theorem Applied to Football
 TYI 30: Expected number of Dice throws
 Believing that the Earth is Round When it Matters
 To Cheer You Up in Difficult Times 31: Federico Ardila's Four Axioms for Cultivating Diversity
 Amazing: Karim Adiprasito proved the gconjecture for spheres!
 To cheer you up in difficult times 27: A major recent "Lean" proof verification
 'Gina Says'
 Aubrey de Grey: The chromatic number of the plane is at least 5
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Monthly Archives: June 2018
Test Your Intuition 35: What is the Limiting Distance?
(Just heard it today from Sergiu Hart.) At time t=0, point A is at the origin (0,0) and point B is distance 1 appart at (0,1). A moves to the right (on the xaxis) with velocity 1 and B moves … Continue reading
Beyond the gconjecture – algebraic combinatorics of cellular spaces I
The gconjecture for spheres is surely the one single conjecture I worked on more than on any other, and also here on the blog we had a sequence of posts about it by Eran Nevo (I,II,III,IV). Here is a great … Continue reading
Posted in Combinatorics, Convex polytopes, Geometry
Tagged Anders Bjorner, Bob MacPherson, Carl Lee, Ed Swartz, Eran Nevo, gconjecture, Günter Ziegler, Isabella Novik, June Huh, Kalle Karu, Karim Adiprasito, KazhdanLustig polynomials, Lou Billera, Marge Bayer, Peter McMullen, Richard Stanley, Ron Adin, Satoshi Murai, Tom Braden
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An Interview with Yisrael (Robert) Aumann
I was privileged to join Menachem Yaari and Sergiu Hart in interviewing Yisrael Aumann. The interview is in Hebrew. It is an initiative of the Israel Academy of Sciences and the Humanities. For our non Hebrew speakers here is in … Continue reading
Posted in Academics, Games, Geometry, Rationality
Tagged Menachem Yaari, Robert Aumann, Sergiu Hart
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Igor Pak is Giving the 2018 Erdős Lectures in Discrete Mathematics and Theoretical Computer Science
Update: The lectures this week are cancelled. They will be given at a later date. Next week Igor Pak will give the 2018 Erdős Lectures Monday Jun 18 2018 Combinatorics — Erdos lecture: Igor Pak (UCLA) “Counting linear extensions” 11:00am to 12:30pm Location: … Continue reading
Posted in Combinatorics, Computer Science and Optimization, Geometry, Updates
Tagged Igor Pak
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Vera T. Sòs, Doctor Philisophiae Honoris Causa, Hebrew University of Jerusalem
Videotaped by Ehud Friedgut.
Sailing into High Dimensions
On June 20 at 13:30 I talk here at HUJI about Sailing into high dimensions. (Thanks to Smadar Bergman for the poster.)
Conference in Singapore, Vietnam, Appeasement, Restorative Justice, Laws of History, and Neutrinos
Eliezer Rabinovici Some weeks ago I returned from a beautiful trip to Singapore and Vietnam. For both me and my wife this was the first trip to these very interesting countries. In Singapore I took part in a very unusual … Continue reading
Posted in Combinatorics, Conferences, Physics, Updates
Tagged Ada Yonath, appeasment, Atul Parikh, David Gross, Dora Love, Eliezer Rabinovici, IsraelIran relationship, Janet Love, Michal Feldman, Partha Dasgupta, Patrick Geary, Penelope Andrews, Singapore, South Africa, Sue Gilligan, Vietnam, Winston Churchill
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A Mysterious Duality Relation for 4dimensional Polytopes.
Two dimensions Before we talk about 4 dimensions let us recall some basic facts about 2 dimensions: A planar polygon has the same number of vertices and edges. This fact, which just asserts that the Euler characteristic of is zero, … Continue reading