Math 2.0

Abstract harmonic analysis Amenability and invariant means Concept

Invariant mean

Summary

An invariant mean on a group is a way to average all bounded functions on the group. The average does not change when the function is translated. A discrete group has a left-invariant mean exactly when it is amenable. Invariant means are the functional form of finitely additive invariant probability measures.

Further reading

  1. Web https://en.wikipedia.org/wiki/Amenable_group
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MSC43A07, 28C10
Changed2 November 2026

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