The Number Warrior is hosting this month’s carnival! It’s up here, and I was impressed with the entries [both in number and quality]. Plus, there was even something on Bourbaki, though not the symbol I wrote on earlier.
I also really like the post right before the Carnival, about a possible case of cheating at the 2009 Philadelphia Inquirer Sudoku National Championship. You can find some of the contest Sudoku puzzles at this pdf.
Now I want to try some Sudoku: here’s one that’s a jigsaw puzzle (created by A.R. Nonenmacher and published under GNU-FDL)