Complexity theory remains one of the great unsolved mathematical puzzles. Kenneth Regan is trying to figure it out. Kenneth Regan paused at lunch in New York to glance at incoming texts from top ...

A chess problem that has stumped mathematicians for more than 150 years has finally been cracked. The n-queens problem began as a much simpler puzzle, and was first posed in an 1848 issue of the ...

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The answers to today’s problems.