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A surface which has no edges.

A plot of the map winding number W resulting from mode locking as a function of Omega for the circle map theta_(n+1)=theta_n+Omega-K/(2pi)sin(2pitheta_n) (1) with K=1. (Since ...

Johnson solid J_(90).

The path traced out by a point P on the edge of a circle of radius b rolling on the outside of a circle of radius a. An epicycloid is therefore an epitrochoid with h=b. ...

An area-preserving affine transformation. Equiaffinities include the crossed hyperbolic rotation, elliptic rotation, hyperbolic rotation, and parabolic rotation.

The radius of the smallest circle centered at one of the points of an N-cluster, which contains all the points in the N-cluster.

The Fuhrmann triangle of a reference triangle DeltaABC is the triangle DeltaF_CF_BF_A formed by reflecting the mid-arc points arcM_A, arcM_B, arcM_C about the lines AB, AC, ...

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.