Recent writing- Micheal Pawliuk: Erdös numbers (May 16)
(This talk was given as part of the What We Talk About lecture series at No One Writes to the Colonel on May 17, 2012) Math is many things: beautiful, - François G. Dorais: Envelope forcing (May 6)
$\newcommand{\RCA}{\mathsf{RCA}_0}\newcommand{\Ind}[1]{\mathsf{I}{#1}}\newcommand{\RT}[2]{\mathsf{RT}^{#1}_{#2}}\newcommand{\Wk}{\mathsf{W}}\newcomman - Assaf Rinot: The chromatic numbers of the Erdos-Hajnal graphs (May 5)
Recall that a coloring $c:G\rightarrow\kappa$ of an (undirected) graph $(G,E)$ is said to be chromatic if $c(v_1)\neq c(v_2)$ whenever $\{v_1,v_2\}\in - Peter Krautzberger: Waiting for the Polymath revolution — thoughts from a bystander (April 30)
Tim Gowers has hinted at a revival of the fifth Polymath project. Which brings something back from the bottom of my draft folder. Let’s talk abo - Joel David Hamkins: The countable models of ZFC, up to isomorphism, are linearly ordered by the submodel relation; indeed, every countable model of ZFC, including every transitive model, is isomorphic to a submodel of its own $L$, New York, 2012 (April 30)
This will be a talk on May 18, 2012 for the CUNY Logic Workshop on some extremely new work. The proof uses finitary digraph combinatorics, including t - Joel David Hamkins: The omega one of infinite chess, New York, 2012 (April 28)
This will be a talk on May 18, 2012 for the CUNY Set Theory Seminar. Infinite chess is chess played on an infinite edgeless chessboard. The familiar - Assaf Rinot: Shelah’s approachability ideal (part 1) (April 25)
Given an infinite cardinal $\lambda$, Shelah defines an ideal $I[\lambda]$ as follows. Definition (Shelah, implicit in here). A set $S$ is in $I[\lamb - Samuel Coskey: Automorphisms of corona algebras, and group cohomology (April 24)
With Ilijas Farah. (arXiv) This article gives a generalization of a (relatively) recent result concerning the Calkin algebra. It is just one of a num - Peter Krautzberger: yay, I’m an editor at ScienceSeeker.org (April 21)
Apparently, I totally forgot to announce this anywhere on my interwebz! With its major code update three weeks ago, scienceseeker.org introduced an ed - Assaf Rinot: Review: Is classical set theory compatible with quantum experiments? (April 19)
Yesterday, I attended a talk at the Quantum Foundations seminar at the beautiful Perimeter Institute for Theoretical Physics (Waterloo, Ontario). The
- Micheal Pawliuk: Erdös numbers (May 16)
- Recent comments
- Comment on The chromatic numbers of the Erdos-Hajnal graphs by X.Shi (May 19)
Great talk. I really enjoyed it. 1. In the last case of the main subclaim, I feel it might be simpler just staying with $j-1$, instead of using $\de - Comment on The chromatic numbers of the Erdos-Hajnal graphs by saf (May 18)
A PDF file with lecture notes for today's talk on this subject, are available here. - Comment on Waiting for the Polymath revolution — thoughts from a bystander by Mike Pawliuk (May 17)
"It could be that the groups of mathematicians that influence the conversations and developments within the mathematical community, e.g., tenur - Comment on Secret Santa 3: The Paradox. by Micheal Pawliuk (May 17)
I forgot that I allowed 0 to be chosen. My argument needs to be adjusted in the obvious way. - Comment on Secret Santa 3: The Paradox. by Micheal Pawliuk (May 17)
So you certainly have one half of the paradox down. Yeah, so how can I conclude that 1220 is either the higher or the lower number? Also, remember th - Comment on Secret Santa 3: The Paradox. by Chris (May 17)
I'm unconvinced by your induction here, as I don't see how the k+1 step generalizes to larger numbers. If you write down 1220 and I pick ei - Comment on The omega one of infinite chess, New York, 2012 by This Week in Logic at CUNY | Set Theory Talks (May 15)
[...] Set Theory Seminar Friday, May 18, 2012 10:00 am GC 6417 Professor Joel David Hamkins (The City University of New York) The omega one of infinit - Comment on yay, I’m an editor at ScienceSeeker.org by Peter Krautzberger (May 13)
Vielen Dank, Patrick. Grüße nach Bonn! - Comment on yay, I’m an editor at ScienceSeeker.org by Patrick Siklossy (May 12)
OK, not scientific - but equally important: HAPPY BIRTHDAY! lieber Peter. Liebe Grüsse aus Bonn, ich wünsche Dir einen herrlichen Tag und viele zuf - Comment on The chromatic numbers of the Erdos-Hajnal graphs by Assaf Rinot: On incompactness for chromatic number of graphs | Set Theory Talks (May 12)
[...] We shall discuss Shelah's paper #1006. [...]
- Comment on The chromatic numbers of the Erdos-Hajnal graphs by X.Shi (May 19)