Abstract
The metric projection to a set \(\emptyset \neq X\subset \mathbb {R}^d\) is not determined everywhere unless X is convex and closed. Sets with positive reach are sets with the property that the metric projection is defined on some open neighbourhood of X.
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Rataj, J., Zähle, M. (2019). Sets with Positive Reach. In: Curvature Measures of Singular Sets. Springer Monographs in Mathematics. Springer, Cham. https://doi.org/10.1007/978-3-030-18183-3_4
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DOI: https://doi.org/10.1007/978-3-030-18183-3_4
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