Concept

Herz–Schur multiplier

In the mathematical field of representation theory, a Herz–Schur multiplier (named after Carl S. Herz and Issai Schur) is a special kind of mapping from a group to the field of complex numbers. Let Ψ be a mapping of a group G to the complex numbers.

Official source

https://en.wikipedia.org/wiki/Herz–Schur_multiplier

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