Monthly Archives: May 2021

To Cheer You Up in Difficult times 24: Borodin’s colouring conjecture!

Posted on May 30, 2021 by Gil Kalai

An acyclic colouring of a graph is a colouring of its vertices so that the subgraph spanned on union of every two colour classes is acyclic (a forest). Grunbaum conjectured in 1973 that Every planar graph has acyclic colouring with … Continue reading →

Posted in Combinatorics | Tagged , | 1 Comment

To cheer you up in difficult times 25: some mathematical news! (Part 2)

Posted on May 20, 2021 by Gil Kalai

Topology Quasi-polynomial algorithms for telling if a knot is trivial Marc Lackenby announced a quasi-polynomial time algorithm to decide whether a given knot is the unknot! This is a big breakthrough. This question is known to be both in NP … Continue reading →

Posted in Algebra, Combinatorics, Geometry, Number theory | 3 Comments

To cheer you up in difficult times 23: the original hand-written slides of Terry Tao’s 2015 Einstein Lecture in Jerusalem

Posted on May 14, 2021 by Gil Kalai

In 2015 Terry Tao gave the Einstein lecture of the Israeli Academy for Science and Humanities. We got hold of the original signed hand-written slides of Terry’s lecture and we are happy to share them with you. The title of … Continue reading →

Posted in Analysis, Applied mathematics, Computer Science and Optimization, Physics, What is Mathematics | Tagged | 1 Comment

Alef Corner: ICM2022

Posted on May 6, 2021 by Gil Kalai

Alef’s new piece for ICM 2022 will surely cheer you up!

Posted in Art, Combinatorics, Geometry, ICM2022 | Tagged , | Leave a comment