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Besicovitch-Federer projection theorem and geodesic flows on Riemann surfaces

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Abstract

We extend the Besicovitch-Federer projection theorem to transversal families of mappings. As an application we show that on a certain class of Riemann surfaces with constant negative curvature and with boundary, there exist natural 2D measures invariant under the geodesic flow having 2D supports such that their projections to the base manifold are 2D but the supports of the projections are Lebesgue negligible. In particular, the union of complete geodesics has Hausdorff dimension 2 and is Lebesgue negligible.

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Correspondence to Risto Hovila.

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Hovila, R., Järvenpää, E., Järvenpää, M. et al. Besicovitch-Federer projection theorem and geodesic flows on Riemann surfaces. Geom Dedicata 161, 51–61 (2012). https://doi.org/10.1007/s10711-012-9693-5

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  • DOI: https://doi.org/10.1007/s10711-012-9693-5

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