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12 May 2017

  • 12:0412:04, 12 May 2017 diff hist +163 Groupoid transformations not symmetries https://math.stackexchange.com/questions/2166616/two-group-theory-statements-that-sound-contradictory-about-the-15-puzzle
  • 11:4711:47, 12 May 2017 diff hist +163 15 puzzle Solvability: transformations not symmetries https://math.stackexchange.com/questions/2166616/two-group-theory-statements-that-sound-contradictory-about-the-15-puzzle

3 July 2015

18 April 2015

3 November 2012