Abstract
Smooth scalar-valued valuations may be thought of as curvature integrals that are robust enough to apply to objects with convex singularities. It turns out that certain kinds of nonconvex singularities are also included. The distinguishing feature is the existence of a normal cycle, which is an integral current that stands in for the manifold of unit normals in case they do not exist in the usual sense. We describe the elements of the normal cycle construction, and sketch how it may be used to establish the fundamental relations of integral geometry, with emphasis on the class of WDC sets recently introduced by Pokorný and Rataj.
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Acknowledgements
Partially supported by NSF grant DMS-1406252. Many thanks to the anonymous referee for a number of helpful suggestions.
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Fu, J.H.G. (2017). Integral Geometric Regularity. In: Jensen, E., Kiderlen, M. (eds) Tensor Valuations and Their Applications in Stochastic Geometry and Imaging. Lecture Notes in Mathematics, vol 2177. Springer, Cham. https://doi.org/10.1007/978-3-319-51951-7_10
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