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A definable set which is the complement of an analytic set.

Two open manifolds M and M^' are cobordant if there exists a manifold with boundary W^(n+1) such that an acceptable restrictive relationship holds.

The converse of Fisher's theorem.

Two lines that lie on top of one another are called coincident lines.

The logarithm of the reciprocal of a number, equal to the negative of the logarithm of the number itself, cologx=log(1/x)=-logx.

An m×1 matrix [a_(11); a_(21); |; a_(m1)].

The value of b, where a=b (mod m), taken to be nonnegative and smaller than m.

A ring is commutative if the multiplication operation is commutative.

Two algebraic objects that are commutative, i.e., A and B such that A*B=B*A for some operation *, are said to commute with each other.

The process of taking the complement of a set or truth function. In the latter case, complementation is equivalent to the NOT operation.