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A type I Markov move.

A positive-height (outward-pointing) pyramid used in augmentation. The term was introduced by B. Grünbaum.

A section of a graph obtained by finding its intersection with a plane.

To rearrange without cutting or pasting.

A type II Markov move.

The set closure of the set of arguments of a function f for which f is not zero.

The Reidemeister move of type I.

An operator defined on a set S which takes two elements from S as inputs and returns a single element of S. Binary operators are called compositions by Rosenfeld (1968). Sets ...

The symbol intersection , used for the intersection of sets, and sometimes also for the logical connective AND instead of the symbol ^ (wedge). In fact, for any two sets A ...

Let A^~, B^~, ... be operators. Then the commutator of A^~ and B^~ is defined as [A^~,B^~]=A^~B^~-B^~A^~. (1) Let a, b, ... be constants, then identities include [f(x),x] = 0 ...