Best Approximation In Inner Product Spaces

By K. Schwab. 2016

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Differential properties of the Moreau envelope (2014, background): “Other important surveys are [5, 7,57] and many facts concerning the convexity of Tchebyshev sets can be found in [16].”
Boundary Value Problems, Weyl Functions, and Differential Operators (2020, background): “The concept of opening of a pair of subspaces goes back to Friedrichs and Dixmier; see for instance [214, 249, 250].”