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6 votes

Introduction of group action as morphism of groups

I prefer just to keep the language as simple as possible and the level of abstraction as low as the circumstances allow when teaching courses for students who see the material for the first time. So ...
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4 votes

Introduction of group action as morphism of groups

Here are two reasons in favour of the definition as a map $G \times A \to A$ (whether they outweigh the reasons in favour of the group homomorphism definition is of course a judgement call). With ...

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