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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeSep 11th 2020

    starting something, on

    v1, current

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeSep 25th 2020

    finally added the actual definition of the model structure

    diff, v4, current

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeOct 2nd 2020
    • (edited Oct 2nd 2020)

    added pointer to:

    diff, v6, current

    • CommentRowNumber4.
    • CommentAuthorUrs
    • CommentTimeOct 24th 2020
    • (edited Oct 24th 2020)

    Let GG be a finite group acting smoothly on a smooth manifold XX. Then the fixed loci X HX^H, for HGH \subset G are smooth manifolds, and hence forming fixed-locus wise vector spaces of smooth differential nn-forms (for any nn \in \mathbb{N}) yields a functor

    GOrbits VectorSpaces G/H Ω dR n(X H) \array{ G Orbits &\longrightarrow& VectorSpaces \\ G/H &\mapsto& \Omega^n_{dR}\big( X^H \big) }

    Question: In which generality are these functors injective objects, and what’s the proof?

    I can show this to be so for the case that GG is: of order 4 or cyclic of prime order.

    From the proof of these special cases it is pretty clear how the general case will work, and I suppose I can prove any number of further special cases by a case-by-case analysis; but it remains unclear to me how to formulate the fully general proof.

    A first inkling of how to approach this issue may be gleaned from the text offered as proof to Prop. 4.3 in Triantafillou 82 (where it’s PL dR forms instead of smooth forms, but the combinatorial part of the argument is the same), but I don’t see how these hints are more than that.

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