Metric Structures for Riemannian and Non-Riemannian Spaces by Mikhail Gromov (auth.)

By Mikhail Gromov (auth.)

Metric conception has gone through a dramatic section transition within the final a long time whilst its concentration moved from the rules of genuine research to Riemannian geometry and algebraic topology, to the idea of countless teams and likelihood theory.

The new wave all started with seminal papers via Svarc and Milnor at the development of teams and the astounding evidence of the stress of lattices through Mostow. This development used to be through the construction of the asymptotic metric idea of endless teams by way of Gromov.

The structural metric method of the Riemannian type, tracing again to Cheeger's thesis, pivots round the idea of the Gromov–Hausdorff distance among Riemannian manifolds. This distance organizes Riemannian manifolds of all attainable topological varieties right into a unmarried attached moduli house, the place convergence permits the cave in of measurement with without notice wealthy geometry, as published within the paintings of Cheeger, Fukaya, Gromov and Perelman. additionally, Gromov came across metric constitution inside homotopy concept and hence brought new invariants controlling combinatorial complexity of maps and areas, comparable to the simplicial quantity, that is liable for levels of maps among manifolds. in the course of the related interval, Banach areas and likelihood concept underwent a geometrical metamorphosis, encouraged via the Levy–Milman focus phenomenon, encompassing the legislation of enormous numbers for metric areas with measures and dimensions going to infinity.

The first phases of the recent advancements have been provided in Gromov's direction in Paris, which become the well-known "Green ebook" through Lafontaine and Pansu (1979). the current English translation of that paintings has been enriched and improved with new fabric to mirror contemporary growth. also, 4 appendices—by Gromov on Levy's inequality, via Pansu on "quasiconvex" domain names, via Katz on systoles of Riemannian manifolds, and via Semmes overviewing research on metric areas with measures—as good as an in depth bibliography and index around out this targeted and gorgeous book.

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0003D2 < : ^ ( £ ) ) < 4 ^ ' ^ ' . But, if A: < n, then # ( D ) is on the order of D^ , namely 38 Metric Structures for Riemannian and Non-Riemannian Spaces for some positive CQ, ci depending on n and X. ^ covers the sphere S^ attached at p with degree at most ciD^ if we do not allow dilatation > D. This gives the upper bound in (*), while the lower bound follows by an actual display of independent bubblings at c::^ CQD^ points in R^ of degrees < CQD. B) and whose universal covering y is (n — l)-connected.

13. Problem: What condition on the metric of the torus T" guarantees that there exist mappings / : T" -^ 5 " with degree d and dilatation 1? We can pose the same question in a slightly different form: Given a metric on T", for which values of d do there exist mappings T^ -^ S^ with degree d and dilatation less than D? C. Homotopy counting Lipschitz maps Given two pointed metric spaces (V, v), {W^ w), we denote by 4f^D the number of homotopy classes of maps from (F, v) to (W, it;) that contain at least one map having dilatation < D.

On the other hand, the distortion of every connected subgroup X of a Lie group A is at most exponential. This is easy to see for A = GLn and for algebraic groups in general (see [GrojAi); the (more difficult) nonalgebraic case was recently settled by Varopoulos (see [Var]). 15+ Polyhedral metrics. Assign a length structure to the standard n-simplex A"" = { x o , x i , . . Xn > 0 : ^ x ^^i —= -1} L; C ^ i=0 n+l ii^ 1. Length Structures: Path Metric Spaces 15 that is invariant under the automorphisms of A^ corresponding to permutations of the vertices of A^ (labelled by the indices 0 , 1 , .

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