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International Journal of Theoretical Physics

Introduction to the 2004 Meeting of the International Quantum Structures Association

Franklin E. Schroeck

Published Nov 1, 2005• 0 citations
Publisher
DOI
10.1007/s10773-005-9007-3

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The fundamental role of an operator is to effect a transformation. Differential operators and matrices are two important examples of how operators can be represented in a concrete way that makes quantitative calculations possible on systems that they represent. Both types of operator play important roles in quantum mechanics and the people shall meet them again. In a sense an operator interrogates a system represented by its eigenfunction, which results in a definite answer given by the eigenvalue. Operators with real eigenvalues also play a key role in quantum theory. Operators with real eigenvalues are conventionally represented by what are termed Hermitian or self-adjoint operators. Non-commutation has important consequences when it comes to information about two different parameters associated with a system. The connection between differentiation of a product, the Leibniz rule, and the commutator bracket, is indicative of the underlying algebraic structure of differential calculus.