Extending Whitney's extension theorem: nonlinear function spaces
Journal article, Peer reviewed
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OriginalversjonAnnales de l'Institut Fourier. 2021. 10.5802/aif.3424
We consider a global, nonlinear version of the Whitney extension problem for manifold-valued smooth functions on closed domains , with non-smooth boundary, in possibly non-compact manifolds. Assuming is a submanifold with corners, or is compact and locally convex with rough boundary, we prove that the restriction map from everywhere-defined functions is a submersion of locally convex manifolds and so admits local linear splittings on charts. This is achieved by considering the corresponding restriction map for locally convex spaces of compactly-supported sections of vector bundles, allowing the even more general case where only has mild restrictions on inward and outward cusps, and proving the existence of an extension operator.