Let N be a normal subgroup of a group G. When does a homomorphism from N to an abelian group A extend to a homomorphism from G to A? When does an irreducible (projective) representation f of N extend to … Continue reading Colloquium: Monday, October 30, 4 pm. Speaker: Yuval Ginosar (Haifa). Title: “Extensions and Obstructions”.
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