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1. Unitary operator: In functional analysis, a unitary operator is a surjective bounded operator on a Hilbert space that preserves the inner product. Unitary operators are usually taken as operating on a Hilbert space, but the same notion serves to define the concept ... (Surjective bounded operator on a Hilbert space preserving the inner product) [100%] 2023-06-08 [Operator theory] [Unitary operators]...
2. Unitary operator: A linear operator $ U $ mapping a normed linear space $ X $ onto a normed linear space $ Y $ such that $ \| Ux \| _ {Y} = \| x \| _ {X} $. The most important unitary operators are those mapping a Hilbert space onto itself. (Mathematics) [100%] 2023-10-17
3. Unitarily-equivalent operators: Linear operators $A$ and $B$, acting in a Hilbert space, with domains of definition $D_A$ and $D_B$, respectively, such that: 1) $UD_A=D_B$; and 2) $UAU^{-1}x=Bx$ for any $x\in D_B$, where $U$ is a unitary operator ... (Mathematics) [74%] 2023-09-13
4. Operator: In physics, an operator is a function over a space of physical states onto another space of physical states. The simplest example of the utility of operators is the study of symmetry (which makes the concept of a group useful ... (Physics) [64%] 2023-11-16 [Operator theory] [Theoretical physics]...
5. Operator: An operator is a mapping from function space to function space. If the range of the operator is on the real line or in the complex plane, the operator is usually called a functional instead. [64%] 2023-02-24 [Mathematics] [Technology]...
6. Operator: A mapping of one set into another, each of which has a certain structure (defined by algebraic operations, a topology, or by an order relation). The general definition of an operator coincides with the definition of a mapping or function. (Mathematics) [64%] 2023-10-17
7. Operator (mathematics): In mathematics, an operator is generally a mapping or function that acts on elements of a space to produce elements of another space (possibly and sometimes required to be the same space). There is no general definition of an operator ... (Mathematics) [64%] 2024-01-01 [Algebra] [Functional analysis]...
8. Operator (linguistics): In generative grammar, the technical term operator denotes a type of expression that enters into an a-bar movement dependency. One often says that the operator "binds a variable". (Linguistics) [64%] 2024-08-04 [Grammar] [Generative syntax]...
9. Operator (computer programming): In computer programming, operators are constructs defined within programming languages which behave generally like functions, but which differ syntactically or semantically. Common simple examples include arithmetic (e.g. (Computer programming) [64%] 2025-03-26 [Operators (programming)] [Programming constructs]...
10. Operator (computer programming): In computer programming, an operator is a programming language construct that provides functionality that may not be possible to define as a user-defined function (i.e. sizeof in C) or has syntax different than a function (i.e. (Computer programming) [64%] 2025-07-10 [Operators (programming)] [Programming constructs]...
11. Unitarity: In quantum physics, unitarity is the condition that the time evolution of a quantum state according to the Schrödinger equation is mathematically represented by a unitary operator. This is typically taken as an axiom or basic postulate of quantum mechanics ... (Physics) [55%] 2023-12-15 [Quantum mechanics]
12. Unitarity (physics): In quantum physics, unitarity is (or a unitary process has) the condition that the time evolution of a quantum state according to the Schrödinger equation is mathematically represented by a unitary operator. This is typically taken as an axiom or ... (Physics) [55%] 2023-12-19 [Quantum mechanics]
13. Unigray: Unigray is a suburb of Johannesburg, South Africa, around 6 km southeast of City Hall. It lies north of Queenshaven, east of Elladoone, and west of Electron. [55%] 2024-01-02 [Suburbs of Johannesburg]
14. Unimart (California): Unimart was a discount retailer in the Greater Los Angeles and San Diego metropolitan areas in the 1960s. Its locations variously became Two Guys, Gemco, and FedMart. (California) [55%] 2023-11-17 [Defunct discount stores of the United States]
15. Unistar: Unistar Servicios Aéreos, o conocida solamente como Unistar, es una aerolínea peruana de vuelos chárter.​ Su centro de operaciones es el Aeropuerto Internacional Jorge Chávez, de la ciudad de Lima. Fue la primera empresa peruana especializada en operaciones de búsqueda ... [55%] 2023-10-09
16. Uniparty: The "Uniparty" is a term that describes the globalist establishment's control over politics and policy to the extent that every or nearly every major political party or politician are controlled by them and, thus, have far more in common ... [55%] 2023-02-03 [Political Terms] [Globalism]...
17. Unimarc: Unimarc es una cadena chilena de supermercados, controlada desde mayo de 2008 por Álvaro Saieh, Juan Rendic y Enrique Bravo a través del grupo chileno Sociedad Supermercados SMU. Desde sus comienzos se ha calificado a Unimarc como un supermercado de ... [55%] 2023-12-03
18. Unicard: UNICARD is a loyalty card scheme run by Universal Card Corporation. It is the most popular loyalty card in Georgia. (Company) [55%] 2024-01-02 [Customer loyalty programs]
19. Uniterm: Uniterm is a subject indexing system introduced by Mortimer Taube in 1951. The name is a contraction of "unit" and "term", referring to its use of single words as the basis of the index, the "uniterms". (Subject indexing system) [55%] 2023-12-30 [Library cataloging and classification]
20. Uniterm: Uniterm is a subject indexing system introduced by Mortimer Taube in 1951. The name is a contraction of "unit" and "term", referring to its use of single words as the basis of the index, the "uniterms". [55%] 2023-12-18 [Library cataloging and classification]