February 21st, 2010

beartato phd

(no subject)

Aha, I thought that LJ was failing to send me comment notifications, but what actually happened was CMU's spam filtering started catching them all as false positives around Feb 18th. Fortunately their webpage portal widget thingy makes whitelisting individual email addresses convenient.
beartato phd

(no subject)

Cute elementary math problem popped up on reddit:

Suppose you start at the origin of the plane, taking steps of distance exactly 1, with the restriction that both coordinates of every point you step on have to be rational. Which points can you get to?

I never in my life thought I'd actually have a reason to understand quadratic residues...