mike | Shared With: Everyone - May 22 2008 | sudoku, math, group theory, puzzlesThere are only 5 billion essentially distinct Sudoku puzzles (solutions) (proof here using Group Theory and Burnside's Lemma).
- mike | Shared With: Everyone - May 11 2008 | sudoku, math, puzzles, programming
Interesting article on rating the difficulty of Sudoku's and various solving methods (including a short backtracking program written in Ruby).
- mike | Shared With: Everyone - Oct 18 2005 | Sudoku, Puzzles, Math
Research paper explaining the computation of the number of unique Sudoku grids (accounting for the equivalence relations from renumbering, permutations, and transposition).
- mike | Shared With: Everyone - Oct 18 2005 | Sudoku, Puzzles, Math
Wikipedia entry on Sudoko has summary of solving techniues and counting of unique Sudoku.
- mike | Shared With: Everyone - Oct 18 2005 | Sudoku, Puzzles, Math
Catalog of all known Sudoku with a minimun number (17) of hints.
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