Isotopy-invariant topological measures on closed orientable surfaces of higher genus

Details Isotopy-invariant topological measures on closed orientable surfaces of higher genus Isotopy-invariant topological measures on closed orientable surfaces of higher genus

2009-03-15

arxiv.org/abs/0903.2659v1

Mathematics

General Topology

26 pages

Scientific paper

Given a closed orientable surface (\Sigma) of genus at least two, we establish an affine isomorphism between the convex compact set of isotopy-invariant topological measures on (\Sigma) and the convex compact set of additive functions on the set of isotopy classes of certain subsurfaces of (\Sigma). We then construct such additive functions, and thus isotopy-invariant topological measures, from probability measures on (\Sigma) together with some additional data. The map associating topological measures to probability measures is affine and continuous. Certain Dirac measures map to simple topological measures, while the topological measures due to Py and Rosenberg arise from the normalized Euler characteristic.

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