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The underlying set of the fundamental group of X is the set of based homotopy classes from the circle to X, denoted [S^1,X]. For general spaces X and Y, there is no natural ...

The converse of Fisher's theorem.

A theorem that guarantees that the trajectory of Langton's ant is unbounded.

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

An abbreviation for the cokernel.

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

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.

A surface which has no edges.

A complex polynomial is a polynomial with complex coefficients.