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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.

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

A heptomino in the shape of the Greek character pi.

A braid in which strands are intertwined in the center and are free in "handles" on either side of the diagram.

A distribution with kurtosis excess gamma_2<0, and therefore having a flattened shape.