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The term "snark" was first popularized by Gardner (1976) as a class of minimal cubic graphs with edge chromatic number 4 and certain connectivity requirements. (By Vizing's ...

A congruence that has a solution.

Denoted sl_n.

A type II Markov move.

L is a subnormal subgroup of H if there is a "normal series" (in the sense of Jordan-Hölder) from L to H.

A quantity which is subtracted from another (the minuend).

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

Q is said to be tightly embedded if |Q intersection Q^g| is odd for all g in G-N_G(Q), where N_G(Q) is the normalizer of Q in G.

A relation R on a set S is transitive provided that for all x, y and z in S such that xRy and yRz, we also have xRz.

In the American system, 10^(42).