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The unitary group U_n(q) is the set of n×n unitary matrices.

A square matrix U is a unitary matrix if U^(H)=U^(-1), (1) where U^(H) denotes the conjugate transpose and U^(-1) is the matrix inverse. For example, A=[2^(-1/2) 2^(-1/2) 0; ...

A number n which is an integer multiple k of the sum of its unitary divisors sigma^*(n) is called a unitary k-multiperfect number. There are no odd unitary multiperfect ...

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

A unitary perfect number is a number n which is the sum of its unitary divisors with the exception of n itself. There are no odd unitary perfect numbers, and it has been ...

Sociable numbers computed using the analog of the restricted divisor function s^*(n) in which only unitary divisors are included.

A transformation of the form A^'=UAU^(H), where U^(H) denotes the conjugate transpose.

Let A be a C^*-algebra having no unit. Then A^~=A direct sum C as a vector spaces together with 1. (a,lambda)+(b,mu)=(a+b,lambda+mu). 2. mu(a,lambda)=(mua,mulambda). 3. ...

The number 1. There are n nth roots of unity, known as the de Moivre numbers.

Capable of taking on exactly one possible value.