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A set which transforms via converse functions. Antisets usually arise in the context of Chu spaces.

The greatest radial distance of an ellipse as measured from a focus. Taking v=pi in the equation of an ellipse r=(a(1-e^2))/(1+ecosv) gives the apoapsis distance r_+=a(1+e). ...

An Artin L-function over the rationals Q encodes in a generating function information about how an irreducible monic polynomial over Z factors when reduced modulo each prime. ...

A polyhex consisting of hexagons arranged along a line.

A common mechanism which generates singularities from smooth initial conditions.

On a computer screen, the pixels indicating a slanted line are selected with Bresenham's algorithm, developed in 1962 while at IBM.

A Chu space is a binary relation from a set A to an antiset X which is defined as a set which transforms via converse functions.

A circle bundle pi:E->M is a fiber bundle whose fibers pi^(-1)(x) are circles. It may also have the structure of a principal bundle if there is an action of SO(2) that ...

Connectivity properties obey the following hierarchy: convex => star convex => pathwise-connected => connected.

Suppose that X^~,X are arcwise-connected and locally arcwise-connected topological spaces. Then (X^~,p) is said to be a covering space of X if p:X^~->X is a surjective ...