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Recent Posts
- My Notices AMS Paper on Quantum Computers – Eight Years Later, a Lecture by Dorit Aharonov, and a Toast to Michael Ben-Or
- Arturo Merino, Torsten Mütze, and Namrata Apply Gliders for Hamiltonicty!
- Updates from Cambridge
- Random Circuit Sampling: Fourier Expansion and Statistics
- Plans and Updates: Complementary Pictures
- Updates and Plans IV
- Three Remarkable Quantum Events at the Simons Institute for the Theory of Computing in Berkeley
- Yair Shenfeld and Ramon van Handel Settled (for polytopes) the Equality Cases For The Alexandrov-Fenchel Inequalities
- On the Limit of the Linear Programming Bound for Codes and Packing
Top Posts & Pages
- My Notices AMS Paper on Quantum Computers - Eight Years Later, a Lecture by Dorit Aharonov, and a Toast to Michael Ben-Or
- Navier-Stokes Fluid Computers
- Arturo Merino, Torsten Mütze, and Namrata Apply Gliders for Hamiltonicty!
- TYI 30: Expected number of Dice throws
- Answer: Lord Kelvin, The Age of the Earth, and the Age of the Sun
- Updates and plans III.
- Elchanan Mossel's Amazing Dice Paradox (your answers to TYI 30)
- Marcelo Campos, Matthew Jenssen, Marcus Michelen and, and Julian Sahasrabudhe: Striking new Lower Bounds for Sphere Packing in High Dimensions
- An interview with Noga Alon
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Monthly Archives: August 2017
Micha Perles’ Geometric Proof of the Erdos-Sos 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
3 Comments
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