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The symmetric group $S_n$ acts naturally on the set $\{1,2,\dots, n\}$. Is this a left or a right action?

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    It depends on your conventions for the order of a function and its argument and for the order of composing functions. It should be a straightforward check of definitions.2011-02-19
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    Left, at least by the conventions I'm used to. (In all fairness, though, I'm not good with left/right things.)2011-02-19

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