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The kernel of a symmetric bilinear form Q:V×V-->R is the set Ker(Q)={v in V|Q(v,w)=0 for all w in V}.

A set of points which do not lie on any of a certain class of hyperplanes.

The problem of determining (or counting) the set of all solutions to a given problem.

The manipulation of Dehn surgery descriptions by a certain set of operations.

The Minkowski measure of a bounded, closed set is the same as its Lebesgue measure.

"The rationals" refers to the set of rational numbers and is commonly denoted Q.

A set of moves which a player plans to follow while playing a game.

Lachlan's term for a set of four lines, no three of which are concurrent.

Lachlan's term for a set of four points, no three of which are collinear.

A relation R on a set S is irreflexive provided that no element is related to itself; in other words, xRx for no x in S.