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Resolution of smooth group actions

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arxiv 1012.5765 v1 pith:SHBSK6EM submitted 2010-12-28 math.DG math.AT

classification math.DGmath.AT
keywords resolutiongroupisotropystructureactionboundarycompactgive
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A refined form of the `Folk Theorem' that a smooth action by a compact Lie group can be (canonically) resolved, by iterated blow up, to have unique isotropy type is proved in the context of manifolds with corners. This procedure is shown to capture the simultaneous resolution of all isotropy types in a `resolution structure' consisting of equivariant iterated fibrations of the boundary faces. This structure projects to give a similar resolution structure for the quotient. In particular these results apply to give a canonical resolution of the radial compactification, to a ball, of any finite dimensional representation of a compact Lie group; such resolutions of the normal action of the isotropy groups appear in the boundary fibers in the general case.

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  1. Classification of locally standard torus actions

    math.GT 2025-07 accept novelty 7.0 of 10

    Locally standard torus actions are classified up to equivariant diffeomorphism by the triple of their quotient, its unimodular labelling, and a degree-two Chern class.

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