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expanded at 2-framing
added a bit more, thanks to pointers from Hisham Sati. Also added cross-link with string structure.
expanded the Definition-section at 2-framing, made explicit why the Spin-lift exists that enters the definition and made explicit the smooth moduli stack of 2-framings.
I am discussing related matters with Domenico behind the scenes. There is now a tentative section Relation to spin^c-structures, too, but I am not sure yet what exactly the statement to be made there should be.
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