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Notion of Torsors
I realise reading some other (equivalent) definition of torsors that they are just generalisations of principal $G$-bundles for some group $G$. … In the definition of torsors they are asking for a similar map to be an isomorphism. …
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Notion of Torsors
I have found the notion of group bundle in Alexandre Grothendieck's "A general theory of fibre spaces with structure sheaf".
This is for my own reference and may be useful for some one who reads tha …