Top Posts
Recent comments
Blogroll
 Astronomy Picture of the Day
 Azimuth
 British Combinatorial Committee
 Comfortably numbered
 Diamond Geezer
 Exploring East London
 From hill to sea
 Gödel's lost letter and P=NP
 Gil Kalai
 Jane's London
 Jon Awbrey
 Kourovka Notebook
 LMS blogs page
 Log24
 London Algebra Colloquium
 London Reconnections
 MathBlogging
 Micromath
 Neill Cameron
 neverendingbooks
 Noncommutative geometry
 numericana hall of fame
 Ratio bound
 Robert A. Wilson's blog
 Since it is not …
 Spitalfields life
 Sylvy's mathsy blog
 SymOmega
 Terry Tao
 The Aperiodical
 The De Morgan Journal
 The ICA
 The London column
 The Lumber Room
 The matroid union
 Theorem of the day
 Tim Gowers
 XKCD
Find me on the web

Join 664 other subscribers
Cameron Counts: RSS feeds
Meta
Tag Archives: graph isomorphism
Pilsen, days 5 and 6
So the conference is over; but before I start a description of the last two days, let me pose a problem which might be an interesting small research topic for someone. As I have said, statisticians love symmetric real matrices. … Continue reading
Pilsen, days 1 and 2
The conference on “Symmetry vs Regularity” in Pilsen has begun. I hesitate at trying to describe the talks, since the first day alone had 13 talks, and the second day 19, of lengths ranging from ten minutes to an hour, … Continue reading
Symmetry vs Regularity
This is the title of a conference to be held next year (2018) from 1 to 7 July, in Pilsen, Bohemia, Czech Republic. The subtitle is “The first 50 years since WeisfeilerLeman stabilization”, and the webpage is here. If you … Continue reading
All kinds of mathematics, 4
The fourth day began with a talk by László Babai on his quasipolynomial algorithm for graph isomorphism. Two longer and more detailed accounts were scheduled for the workshop; this talk gave the context, and an important lemma which underlies the … Continue reading
Update on Babai’s result
I learned yesterday that Harald Helfgott had found a mistake in László Babai’s result on the complexity of graph isomorphism. The algorithm and the bulk of the analysis still stands; it was just problem with the accounting showing that the … Continue reading
Graph isomorphism
I just read Ken Regan’s report on the Gödel’s Last Letter blog that Laci Babai has a quasipolynomial algorithm for graph isomorphism “Quasipolynomial” means exp(O((log n)c)) for some c: c = 1 would be polynomial. Congratulations Laci! Oh, and here he is at … Continue reading