Sunday 2 August 2015, 04:09
I have posted a
detailed set of notes (PDF file)
describing the theory behind my Black Swan Suite, detailing
the endless chase of Elmer and Daffy across Penrose, pinwheel, and other
nonperiodic tilings of the plane. Fans of
music and computational geometry may find the document interesting. At the
very least, it was fun to typeset.
Friday 12 June 2015, 11:15
This was originally a Facebook comment, to one of my friends who had
posted one of the original articles there, but a lot of other people in my
circles are re-sharing the same articles, more general distribution of these
comments is appropriate, and anyway Facebook is an untrustworthy platform.
So, here's a repost. For necessary context, see the earlier articles
Schlosser and Koritha Mitchell.
Both of these articles have received a whole lot of circulation in the last few days,
but I'm not sure they've received enough serious attention.
Thursday 1 January 2015, 04:38
On this first day of 2015 I'm writing down some things that are important
and that I wish people around me would know. There's nothing here that I
haven't said before. My usual pattern is to say something and treat it as
settled, because I expect everyone present at the time to remember it once
they've been told. But not all of my friends have been paying attention to
all of my writings for all of the decades I have been writing, and maybe at
this time some repetition is appropriate. I wish I could have ten thousand
readers for this and for all of my important postings. I may be lucky to
get as many as ten readers. But if nothing else, the exercise of choosing
what I want to say today is of some use to me personally, whether anybody
reads it or not.
Wednesday 31 December 2014, 13:16
It's New Year's Eve in Copenhagen, and time for another update.
Friday 5 December 2014, 23:15
LaTeX Advent Calendar 2014に僕の寄贈です。
Sunday 2 November 2014, 02:07
As I start writing this, it is the evening of November 1 and I am sitting
in my new apartment on Hallandsgade, Amagerbro, Copenhagen. It'll probably
be the 2nd before I can post it, because I don't have the Net here. It sure
looks like Rabbi Schlomo Yitschaki was dead right about the
tzaraath of houses. Now I kind of want to read the rest of his
many volumes of commentaries on Jewish religious law.
Thursday 30 October 2014, 12:16
In January of 2011, I had recently arrived at the University of Manitoba
to work as a postdoc with Stephane Durocher. One of the first things he
asked me to do was find out how many cycles there are in an n-dimensional
hypercube graph, for general n. At the time, he and I both assumed that
that meant spending maybe half an hour in the library looking up the
Since then it's been more than three years; thousands of lines of
computer code and months of CPU time; we added two more co-authors; we
didn't solve the original problem, and didn't completely solve the
other problem that we ended up working on, either; but here's a journal
paper, anyway, and I think it's pretty interesting. The official definitive
version will be free to access until mid-December and then will go
behind Elsevier's paywall; the authors' accepted manuscript on
arXiv is permanently accessible.
Read the paper if you're interested in the math details; in this entry
I'm going to try to tell the story behind the paper, in relatively
non-mathematical terms. I'm hoping it'll be of interest to my Web log
readers and give you some idea, because I often get asked this, of what I
actually do at work.
Wednesday 15 October 2014, 11:49
Every time I think I've seen it all with regard to Danish excuses, this place
surprises me. Today's excuse is tzaraath.
Saturday 4 October 2014, 13:23
I've been in Denmark just over a month, and I'm pretty stressed. This
update is going to be somewhat disconnected. You can get some idea of what
my experience has been like by watching the famous Bank Account