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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
 The Argument Against Quantum Computers  A Very Short Introduction
 Answer: Lord Kelvin, The Age of the Earth, and the Age of the Sun
 Reflections: On the Occasion of Ron Adin's and Yuval Roichman's Birthdays, and FPSAC 2021
 TYI 30: Expected number of Dice throws
 The Intermediate Value Theorem Applied to Football
 Zur Luria on the nQueens Problem
 Gil's Collegial Quantum Supremacy Skepticism FAQ
 Amazing: Karim Adiprasito proved the gconjecture for spheres!
 To cheer you up in difficult times 5: A New Elementary Proof of the Prime Number Theorem by Florian K. Richter
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Monthly Archives: March 2019
Is it Legitimate/Ethical for Google to close Google+?
Update April 2, 2019: the links below are not working anymore. Google Plus is a nice social platform with tens of millions participants. I found it especially nice for scientific posts, e.g. by John Baez, Moshe Vardi, or about symplectic … Continue reading
10 Milestones in the History of Mathematics according to Nati and Me
Breaking news: David Harvey and Joris Van Der Hoeven. Integer multiplication in time O(nlogn). 2019. (I heard about it from Yoni Rozenshein on FB (חפירות על מתמטיקה); update GLL post. ) _____ Update: There were many interesting comments here and … Continue reading
TYI38 Lior Kalai: Monty Hall Meets Survivor
For breaking news, scroll down. Lior Kalai: Survivor Meets the Monty Hall Puzzle We start with the classical question and go on with a new version contributed by my son Lior. Update: A few brief comments on the original problem … Continue reading
Posted in personal, Probability, Riddles, Test your intuition, Women in science
Tagged Karen Uhlenbeck, Lior Kalai, Monty Hall problem, Survivor
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News on Fractional Helly, Colorful Helly, and Radon
My 1983 Ph D thesis was on Hellytype theorems which is an exciting part of discrete geometry and, in the last two decades, I have had an ongoing research project with Roy Meshulam on topological Hellytype theorems. The subject found … Continue reading
8866128975287528³+(8778405442862239)³+(2736111468807040)³
Update: The result was achieved by Andrew Booker from Bristol. Here is the preprint Cracking the problem with 33. It is a notoriously difficult open problem which integers can be written as the sum of three integer cubes. Such integers … Continue reading
Test Your Intuition (or simply guess) 37: Arithmetic Progressions for Brownian Motion in Space
Consider a Brownian motion in three dimensional space. What is the largest number of points on the path described by the motion which form an arithmetic progression? (Namely, , so that all are equal.) A 2D picture; In … Continue reading
Test Your Intuition (or knowledge, or programming skills) 36
How much is The product ranges over all primes. In other words, Just heard it from Avinoam Mann.
Bob Sedgewick’s Free Online Courses on Analysis of Algorithms and Analytic Combinatorics.
Philippe Flajolet 19482011 I am happy to forward the announcement on two free online courses (Mooks) by Bob Sedgewick Analysis of Algorithms and Analytic Combinatorics. Analysis of Algorithms page provides access to online lectures, lecture slides, and assignments for … Continue reading