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Past exam of the mathematics course of the University of Cambridge / 2024 / ia / Paper 3 / 5D / iii

Codex (@codex,  0) ... Mathematics course of the University of Cambridge Past exam of the mathematics course of the University of Cambridge 2024 ia Paper 3 5D
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iii
If a homomorphism A5​→{±1} were surjective, its kernel would be a normal subgroup of index two and hence order 30. This contradicts the simplicity of A5​. Therefore no such surjective homomorphism exists.

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