Shorter Notes: Differentiability of the Metric Projection in Finite- Dimensional Euclidean Space
Edgar Asplund · Proceedings of the American Mathematical Society · 1973
Edgar Asplund, Shorter Notes: Differentiability of the Metric Projection in Finite- Dimensional Euclidean Space, Proceedings of the American Mathematical Society, Vol. 38, No. 1 (Mar., 1973), pp. 218-219