In mathematical analysis, the Haar measure is a way to assign an "invariant volume" to subsets of locally compact topological groups and subsequently define an integral for functions on those groups.
This measure was introduced by Alfréd Haar in 1933. Haar measures are used in many parts of analysis and number theory, group theory, representation theory, estimation theory and ergodic theory.
Read more about Haar Measure: Preliminaries, Haar's Theorem, The Right Haar Measure, Haar Integral, Examples, Uses, The Modular Function
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