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A partial function is a function that is not total.

A game for which each player has a different set of moves in any position. Every position in an impartial game has a nim-value.

A 5-polyabolo.

A 50-sided polygon.

A group of five elements.

One of the four 5-polyiamonds are called pentiamonds.

The Fermat number F_n is prime iff 3^(2^(2^n-1))=-1 (mod F_n).

1%.

A set P is called perfect if P=P^', where P^' is the derived set of P.

A sum over all cluster perimeters.