Multiplicative character

In mathematics, a multiplicative character (or linear character, or simply character) on a group "G" is a group homomorphism from "G" to the multiplicative group of a field , usually the field of complex numbers. If "G" is any group, then the set Ch("G") of these morphisms forms an abelian group under pointwise multiplication.
This group is referred to as the character group of "G". Sometimes only "unitary" characters are considered (characters whose image is in the unit circle); other such homomorphisms are then called "quasi-characters". Dirichlet characters can be seen as a special case of this definition.
Multiplicative characters are linearly independent, i.e. if formula_1 are different characters on a group "G" then from formula_2 it follows that formula_3