Erdös Lap Number

Posted by tpc at June 20th, 2009

Erdös apparently liked to have children sit on his lap. See this 1969 conference photo
http://staff.spd.dcu.ie/johnbcos/oxford.htm
(There is also a young dashing George Andrews on the left.)
So it was funny to see this page on the lap number.

Unfortunately, my Erdös number is still 4. I probably could decrease it to 3 by randomly putting my thesis advisor’s thesis advisor’s name into some future paper. It is either that or wait till the apocalyse.
http://xkcd.com/599/

Posted in Fun Stuff| No Comments | 

Benchmark

Posted by tpc at June 18th, 2009

I got myself a hp tx2 tablet running on amd Turion with 4GB ram. A dear friend helped me upgraded to vista 64 bit in order to fully utilize the ram. I tested it against the desktop running xp 32 bit on pentium core 2 duo. I was told that this desktop actually has 8GB ram but xp 32 bit only recognise 3 GB.

It was not a rigourous test by any means but I got both systems to try and factor
2^{2^9}-1 =
(3)(5)(17)(257)(641)
(93461639715357977769163558199606896584051237541638188580280321)
(5704689200685129054721)(59649589127497217)(1238926361552897)
(67280421310721)(6700417)(65537)(274177)

Anyone want to verify the computation?

It took 2141 seconds on the notebook which, according to the software, utilized 2.3 GB but 2300 seconds on the desktop which utilized 2GB. So it’s probably the memory that made all the 10% difference.

Posted in Technology| No Comments | 

The late Richard Lewis

Posted by tpc at June 6th, 2009

I’ve never met him, but he did research in the area of partitions and was a friend of several people I know. One of them - Shaun Cooper - by pure chance found a reference to Richard in the 1996 autobiography of Howard Marks named “Mr Nice”. On the cover it said of Marks “He was Britain’s most wanted man. He has just spent seven years in America’s toughest penitentiary. You’ll like him.”

On page 73, here’s a paragraph of what he had to say.

There were one or two ex-Oxford students attached to the University of Sussex. One was a brilliant mathematics lecturer, Richard Lewis, who would often visit Ilze and me along with Johnny and Gina Martin. Richard came from a relatively wealthy family, owned property in Brighton and London, drank like a fish, smoked everything at hand, thought mathematical profundities, and was a keen and talented chess player. He had heard of Go, was interested in the game, but had never played. I taught him. After a dozen games, he beat me. He still beats me.

There are a few more references to Richard and his wife in the following pages, get the book and read it!

Posted in Quotes/People| No Comments |