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The covercosine, also called the coversed cosine, is a little-used trigonometric function defined by covercos(z) = vercos(1/2pi-z) (1) = 1+sinz, (2) where vercosz is the ...

The digon is the degenerate polygon (corresponding to a line segment) with Schläfli symbol {2}.

Characterized by allowing only integer values.

The system of partial differential equations u_t = (u^2-u_x+2v)_x (1) v_y = (2uv+v_x)_x. (2)

A binary relation associated with an instance of the stable marriage problem. Stable marriages correspond to vertices with outdegree 0 in the divorce digraph (Skiena 1990, p. ...

A number of attractive 10-compounds of the regular dodecahedron can be constructed. The compound illustrated above will be implemented in a future version of the Wolfram ...

The surface with three cross-caps (Francis and Collins 1993, Francis and Weeks 1999).

A curve in two dimensions on which the value of a function f(x,y) is a constant. Other synonymous terms are isarithm, isopleth, and contour line. A plot of several ...

A Euclidean motion of R^n is an affine transformation whose linear part is an orthogonal transformation.

The knots that make up a knot sum of a composite knot are known as factor knots (Adams 1994, p. 8).