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Not decidable as a result of being neither formally provable nor unprovable.

A horizontal line placed under a symbol to indicate some special property. Underscores are sometimes used instead of over-arrows or bold typeface to indicate a vector, for ...

A unilateral shift is a weighted shift T for which alpha_n=1 for all n.

A cube whose edge lengths are 1. The unit cube therefore has unit volume.

A square with side lengths 1. The unit square usually means the one with coordinates (0, 0), (1, 0), (1, 1), (0, 1) in the real plane, or 0, 1, 1+i, and i in the complex ...

Let A be a C^*-algebra, then two element a,b of A are called unitarily equivalent if there exists a unitary u in A such that b=uau^*.

A multiplicative character is called unitary if it has absolute value 1 everywhere.

Involving one variable, as opposed to two (bivariate) or many (multivariate).

A position in a game is unsafe for player A if the person who plays next (player B) can win. Every unsafe position can be made safe by at least one move.

A fixed point for which the stability matrix has eigenvalues of the form lambda_+/-=alpha+/-ibeta (with alpha,beta>0).