At 12:10 AM 5/1/2006, R. William Gosper wrote:
PS, It can't be news to serious sudokulists, but making the rounds of Mountain View High School is http://gosper.org/sud5.PNG, a quincunx of overlapping 9x9s with clues in four concentric rings.
From the NYTimes today, a Sudoku that wasn't solved within the time constraints: 8__75___3 _3__48_2_ 1_______6 34__7___8 79_48__31 2_8____74 5__814__7 _8_327_4_ 4__569__2 Notice that the NYTimes huffs at other newspapers that print Sudoku's, because it doesn't print any itself. ---- I did a Google search on "sudoku" and "direct product", but didn't come up with anything interesting. Since 9=3*3, isn't it possible that at least some Sudoku's are direct product constructions? Aren't at least some Sudoku's the product table of a 9-element group?