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A 5-polyabolo.

A 50-sided polygon.

A group of five elements.

One of the four 5-polyiamonds are called pentiamonds.

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)).

If p is prime, then p|P(p), where P(p) is a member of the Perrin sequence 3, 0, 2, 3, 2, 5, 5, 7, 10, 12, 17, ... (OEIS A001608). A Perrin pseudoprime is a composite number n ...

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

An affine isoperimetric inequality.

A heptomino in the shape of the Greek character pi.

pi may be computed using a number of iterative algorithms. The best known such algorithms are the Archimedes algorithm, which was derived by Pfaff in 1800, and the ...