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The image of the path gamma in C under the function f is called the trace. This usage of the term "trace" is unrelated to the same term applied to matrices or tensors.

A 5-polyabolo.

A group of five elements.

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

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

A sum over all cluster perimeters.

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

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.