Operator algebra is a branch of mathematics that deals with the study of operators, particularly in the context of functional analysis and quantum mechanics. It focuses on the algebraic structures that arise from collections of bounded or unbounded linear operators acting on a Hilbert space or a Banach space. Key concepts in operator algebra include: 1. **Operators:** These are mathematical entities that act on elements of a vector space. In quantum mechanics, operators represent observable quantities (like position, momentum, and energy).
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An operator algebra is an algebra of linear operators, with multiplication given by composition. In quantum examples it can be generated by creation and annihilation operators subject to the canonical commutation relations or canonical anticommutation relations. Its analytic realization requires specifying a common domain for unbounded operators.