Haar measure

(from the article `mathematics`) Yet another setting for Lebesgue`s ideas was to be the theory of Lie groups. The Hungarian mathematician Alfréd Haar showed how to define the concept ...
Found on http://www.britannica.com/eb/a-z/h/1

Haar measure

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, number theory, group theory, representation .....
Found on http://en.wikipedia.org/wiki/Haar_measure
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