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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.

One of the four 5-polyiamonds are called pentiamonds.

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

A sum over all cluster perimeters.

A fractal process for which H>1/2, so r>0.

A heptomino in the shape of the Greek character pi.

alpha is called a predecessor if there is no ordinal number beta such that beta+1=alpha.

An operator in logic which returns either true or false.

A set class which is not a set.