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Rule 50 is one of the elementary cellular automaton rules introduced by Stephen Wolfram in 1983 (Wolfram 1983, 2002). It specifies the next color in a cell, depending on its ...

An amphichiral knot is a knot that is capable of being continuously deformed into its own mirror image. More formally, a knot K is amphichiral (also called achiral or ...

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

If two quantities A and B are approximately equal, this is written A approx B.

Capable of taking on one out of two possible values.

A cellular space is a T2-space that has the structure of a so-called CW-complex.

A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.

The index set for the collection of submodules in a graded module.

Related to one another by a homomorphism.

The fifth of Peano's axioms, which states: If a set S of numbers contains zero and also the successor of every number in S, then every number is in S.