Ponder This Challenge - September 2002 - Closed subsets of boolean operatorsPuzzleDon Coppersmith01 Sep 2002Ponder This
Ponder This Challenge - August 2002 - Drawing 4D hypercube on a gridPuzzleDon Coppersmith01 Aug 2002Ponder This
Ponder This Challenge - July 2002 - 23 prisoners and a switch roomPuzzleDon Coppersmith01 Jul 2002Ponder This
Ponder This Challenge - June 2002 - Coin weighing using scalePuzzleDon Coppersmith01 Jun 2002Ponder This
Ponder This Challenge - May 2002 - Circle passing via 7 lattice pointsPuzzleDon Coppersmith01 May 2002Ponder This
Ponder This Challenge - April 2002 - Lifetime of adjacent differencesPuzzleDon Coppersmith01 Apr 2002Ponder This
Ponder This Challenge - March 2002 - Coffe or tea majority clubPuzzleDon Coppersmith01 Mar 2002Ponder This
Ponder This Challenge - February 2002 - Undirected graph of diameter 2PuzzleDon Coppersmith01 Feb 2002Ponder This
Ponder This Challenge - December 2001 - Knight's tour on 4xN chess boardsPuzzleDon Coppersmith01 Dec 2001Ponder This
Ponder This Challenge - November 2001 - PB&J asymmetry boundsPuzzleDon Coppersmith01 Nov 2001Ponder This
Ponder This Challenge - October 2001 - f maps any open interval onto RPuzzleDon Coppersmith01 Oct 2001Ponder This
Ponder This Challenge - September 2001 - Bounds on a permutation groupPuzzleDon Coppersmith01 Sep 2001Ponder This
Ponder This Challenge - July 2001 - 1/1 + 2/(2+3) + 3/(4+5+6) + ...PuzzleDon Coppersmith01 Jul 2001Ponder This
Ponder This Challenge - June 2001 - Goblin chase in a trainPuzzleDon Coppersmith01 Jun 2001Ponder This