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A 100-sided polygon, virtually indistinguishable in appearance from a circle except at very high magnification.

A circle-preserving transformation composed of an even number of inversions.

A polynomial with real positive coefficients and roots which are either negative or pairwise conjugate with negative real parts.

A curve created by starting with a circle, dividing it into six arcs, and flipping three alternating arcs. The process is then repeated an infinite number of times.

An unsolved problem in mathematics attributed to Lehmer (1933) that concerns the minimum Mahler measure M_1(P) for a univariate polynomial P(x) that is not a product of ...

The limaçon is a polar curve of the form r=b+acostheta (1) also called the limaçon of Pascal. It was first investigated by Dürer, who gave a method for drawing it in ...

A set considered together with the sigma-algebra on the set.

In the American system, 10^(57).

A bicupola in which the bases are in the same orientation.

Orthogonal contravariant and covariant satisfy g_(ik)g^(ij)=delta_k^j, where delta_j^k is the Kronecker delta.