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A uniquely complemented lattice is a complemented lattice (L, ^ , v ,0,1,^') that satisfies ( forall x in L)( forall y in L)[(x ^ y=0) ^ (x v y=1)]=>y=x^'. The class of ...

A point lattice which can be constructed from an arbitrary parallelogram of unit area. For any such planar lattice, the minimum distance c between any two points is a ...

An R-module M is said to be unital if R is a commutative ring with multiplicative identity 1=1_R and if 1m=m for all elements m in M.

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^*.

An operator U satisfying U^|U = 1 (1) UU^| = 1, (2) where U^| is the adjoint.

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

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

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

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

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