
handle: 11568/48786
Let \(X\) and \(Y\) be compact smooth manifolds without boundary. By \(\text{VMO} (X,Y)\) (vanishing mean oscillation) is understood the class of maps from \(X\) to \(Y\) introduced by \textit{H. Brezis} and \textit{L. Nirenberg} in their paper [Sele. Math., New Ser. 1, 197-263 (1995; Zbl 0852.58010)]. The set \(\text{VMO} (X,Y)\) is equipped with a metric paracompact topology and contains the space \(C(X,Y)\) as a proper dense subset. The author proves that the inclusion map \(i: C(X,Y)\hookrightarrow \text{VMO} (X,Y)\) is a homotopy equivalence. Combining this with a well-known theorem of Whitney asserting that the inclusion \(C^k(X,Y) \hookrightarrow C(X,Y)\) is a homotopy equivalence for \(1\leq k\leq\infty\), he obtains the, following sequence of homotopy equivalences: \[ C^\infty(X,Y) \hookrightarrow C^k(X,Y) \hookrightarrow\cdots C^1(X,Y) \hookrightarrow C(X,Y) \hookrightarrow \text{VMO}(X,Y). \] This implies that all the homotopy, homology and cohomology groups of \(\text{VMO} (X,Y)\) are isomorphic via the homomorphisms induced by inclusion to the corresponding groups of \(C^\infty(X,Y)\).
metric paracompact topology, vanishing mean oscillation, homotopy equivalence, compact smooth manifolds without boundary, Sobolev spaces and other spaces of ``smooth'' functions, embedding theorems, trace theorems, homotopy, homology and cohomology groups, Integration on manifolds; measures on manifolds, Embedding
metric paracompact topology, vanishing mean oscillation, homotopy equivalence, compact smooth manifolds without boundary, Sobolev spaces and other spaces of ``smooth'' functions, embedding theorems, trace theorems, homotopy, homology and cohomology groups, Integration on manifolds; measures on manifolds, Embedding
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