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Hey guys

Im not sure if this question belongs in this forum but anyway. Can someone please explain a group action to me? I vaguely understand but the notes i have for it are pretty crap and the interweb hasnt been of much use (neither has my cryptic lecturer). You can take it as a given (obviously) that i know the pre-requisites for groups and how to use them (sort of ) for your answer. Is it simply that for g an element in group G under binary operation * that the 'action' is g*x where x is something else like a point in R2 or something? And that this is special because when you do it for a collection of points (ie an object) it does something significant?

Cheers!

-Graeme

Im not sure if this question belongs in this forum but anyway. Can someone please explain a group action to me? I vaguely understand but the notes i have for it are pretty crap and the interweb hasnt been of much use (neither has my cryptic lecturer). You can take it as a given (obviously) that i know the pre-requisites for groups and how to use them (sort of ) for your answer. Is it simply that for g an element in group G under binary operation * that the 'action' is g*x where x is something else like a point in R2 or something? And that this is special because when you do it for a collection of points (ie an object) it does something significant?

Cheers!

-Graeme

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