Representation Theory
A group homomorphism from a group G to a projective linear group is called a projective representation of the group G, by analogy with a linear representation (a homomorphism ). These were studied by Issai Schur, who showed that projective representations of G can be classified in terms of linear representations of central extensions of G. This led to the Schur multiplier, which is used to address this question.
Read more about this topic: Projective Linear Group
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