Recent Comments

Recent Posts
 My Very First Book “Gina Says”, Now Published by “World Scientific”
 Itai Benjamini: Coarse Uniformization and Percolation & A Paper by Itai and me in Honor of Lucio Russo
 AfterDinner Speech for Alex Lubotzky
 Boaz Barak: The different forms of quantum computing skepticism
 Bálint Virág: Random matrices for Russ
 Test Your Intuition 33: The Great Free Will Poll
 Mustread book by Avi Wigderson
 High Dimensional Combinatorics at the IIAS – Program Starts this Week; My course on Hellytype theorems; A workshop in Sde Boker
 Stan Wagon, TYI 23: Ladies and Gentlemen: The Answer
Top Posts & Pages
 About
 My Very First Book "Gina Says", Now Published by "World Scientific"
 TYI 30: Expected number of Dice throws
 Elchanan Mossel's Amazing Dice Paradox (your answers to TYI 30)
 Why Quantum Computers Cannot Work: The Movie!
 The Race to Quantum Technologies and Quantum Computers (Useful Links)
 Answer: Lord Kelvin, The Age of the Earth, and the Age of the Sun
 Amazing: Peter Keevash Constructed General Steiner Systems and Designs
 Can Category Theory Serve as the Foundation of Mathematics?
RSS
Author Archives: Gil Kalai
TYI 30: Expected number of Dice throws
Test your intuition: You throw a dice until you get 6. What is the expected number of throws (including the throw giving 6) conditioned on the event that all throws gave even numbers. followup post Advertisements
Test your intuition 29: Diameter of various random trees
Both trees in general and random trees in particular are wonderful objects. And there is nothing more appropriate to celebrate Russ Lyons great birthday conference “Elegance in Probability” (taking place now in Tel Aviv) than to test your intuition, dear … Continue reading
Posted in Combinatorics, Probability, Test your intuition
Tagged Russ Lyons, Test your intuition
19 Comments
Micha Perles’ Geometric Proof of the ErdosSos Conjecture for Caterpillars
A geometric graph is a set of points in the plane (vertices) and a set of line segments between certain pairs of points (edges). A geometric graph is simple if the intersection of two edges is empty or a vertex … Continue reading
Touching Simplices and Polytopes: Perles’ argument
Joseph Zaks (1984), picture taken by Ludwig Danzer (OberWolfach photo collection) The story I am going to tell here was told in several places, but it might be new to some readers and I will mention my own angle, … Continue reading
Posted in Combinatorics, Convex polytopes, Geometry, Open problems
Tagged Joseph Zaks, Micha A. Perles
Leave a comment
Where were we?
I was slow blogging, and catching up won’t be so easy. Of course, this brings me back to the question of what I should blog about. Ideally, I should tell you about mathematical things I heard about. The problem is … Continue reading
Call for nominations for the Ostrowski Prize 2017
Call for nominations for the Ostrowski Prize 2017 The aim of the Ostrowski Foundation is to promote the mathematical sciences. Every second year it provides a prize for recent outstanding achievements in pure mathematics and in the foundations of … Continue reading
Twelves short videos about members of the Department of Mathematics and Statistics at the University of Victoria
Very nice mathematical videos!
Posted in Academics, Movies, What is Mathematics
Leave a comment
Jozsef Solymosi is Giving the 2017 Erdős Lectures in Discrete Mathematics and Theoretical Computer Science
May 4 2:303:30; May 7 11:0013:00; May 10 10:3012:00 See the event webpage for titles and abstracts (or click on the picture below).
Updates (belated) Between New Haven, Jerusalem, and TelAviv
This is a (very much) belated update post from the beginning of March (2016). New Haven I spent six weeks in February (2016) in New Haven. It was very nice to get back to Yale after more than two years. Here … Continue reading