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Unitary group. In mathematics, the unitary group of degree n, denoted U ( n ), is the group of n × n unitary matrices, with the group operation of matrix multiplication. The unitary group is a subgroup of the general linear group GL (n, C), and it has as a subgroup the special unitary group, consisting of those unitary matrices with determinant 1.
In linear algebra, an invertible complex square matrix U is unitary if its matrix inverse U−1 equals its conjugate transpose U*, that is, if. where I is the identity matrix . In physics, especially in quantum mechanics, the conjugate transpose is referred to as the Hermitian adjoint of a matrix and is denoted by a dagger (†), so the ...
UCC-1 financing statement. A UCC-1 financing statement (an abbreviation for Uniform Commercial Code -1) is a United States legal form that a creditor files to give notice that it has or may have an interest in the personal property of a debtor (a person who owes a debt to the creditor as typically specified in the agreement creating the debt).
Special unitary group. In mathematics, the special unitary group of degree n, denoted SU (n), is the Lie group of n × n unitary matrices with determinant 1. The matrices of the more general unitary group may have complex determinants with absolute value 1, rather than real 1 in the special case. The group operation is matrix multiplication.
The U(1) symmetry. For the leptons, the gauge group can be written SU(2) l × U(1) L × U(1) R. The two U(1) factors can be combined into U(1) Y × U(1) l where l is the lepton number. Gauging of the lepton number is ruled out by experiment, leaving only the possible gauge group SU(2) L × U(1) Y. A similar argument in the quark sector also ...
The U visa is a United States nonimmigrant visa which is set aside for victims of crimes (and their immediate family members) who have suffered substantial mental or physical abuse while in the U.S. and who are willing to assist law enforcement and government officials in the investigation or prosecution of the criminal activity. [1]
This form is a special case of the curvature form on the U(1) principal bundle on which both electromagnetism and general gauge theories may be described. The connection form for the principal bundle is the vector potential, typically denoted by A, when represented in some gauge. One then has
U.2. U.2 (pronounced 'u-dot-2' [1] ), using the port SFF-8639, is a computer interface standard for connecting solid-state drives (SSDs) to a computer. It covers the physical connector, electrical characteristics, and communication protocols. It was developed for the enterprise market and designed to be used with new PCI Express drives along ...