Two Coin-Flipping Problems: How likely is it to get three heads before eight tails? Two solved puzzles. TeX source, PDF output. Update on 2007-12-29: Fixed a typo pointed out here.
Vectors: An unfinished paper with some interesting discussion of vectors and the hash product (from which I derived my pseudonym) amid Principia Mathematica-ish theorem after theorem. TeX source, PDF output.