Multiplicative Character
A continuous homomorphism of a group into the nonzero complex numbers. A multiplicative character omega gives a group representation on the one-dimensional space C of complex numbers, where the group representation action by g in G is multiplication by omega(g). A multiplicative character is unitary if it has absolute value 1 everywhere.
See also
Grössencharakter, Unitary Multiplicative CharacterExplore with Wolfram|Alpha
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References
Knapp, A. W. "Group Representations and Harmonic Analysis, Part II." Not. Amer. Math. Soc. 43, 537-549, 1996.Referenced on Wolfram|Alpha
Multiplicative CharacterCite this as:
Weisstein, Eric W. "Multiplicative Character." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/MultiplicativeCharacter.html