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A 50-sided polygon.

A group of five elements.

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 point x_0 is said to be a periodic point of a function f of period n if f^n(x_0)=x_0, where f^0(x)=x and f^n(x) is defined recursively by f^n(x)=f(f^(n-1)(x)).

An integral which is equivalent to the Denjoy integral "in the restricted sense."

An affine isoperimetric inequality.

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.