Abstract
In this note we discuss the geometry of Riemannian surfaces having a discrete set of singular points. We assume the conformal structure extends through the singularities and the curvature is integrable. Such points are called simple singularities. We first describe them locally and then globally using the notion of (real) divisor. We formulate a Gauss–Bonnet formula and relate it to some asymptotic isoperimetric ratio. We prove a classifications theorem for flat metrics with simple singularities on a compact surface and discuss the Berger–Nirenberg Problem on surfaces with a divisor. We finally discuss the relation with spherical polyhedra.
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Acknowledgements
First published as: Surfaces riemanniennes à singularités simples. In Differential geometry: geometry in mathematical physics and related topics, 619–628, Proc. Sympos. Pure Math., 54, Part 2, Amer. Math. Soc., Providence, RI, 1993. Translated from French by the author.
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Troyanov, M. (2023). Riemannian Surfaces with Simple Singularities. In: Fillastre, F., Slutskiy, D. (eds) Reshetnyak's Theory of Subharmonic Metrics. Springer, Cham. https://doi.org/10.1007/978-3-031-24255-7_3
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