T. S. Motzkin1, I. J. Schoenberg2
1University of California, Los Angeles
2University of Pennsylvania,
Tóm tắt
Let A be a closed set of points in the n-dimensional euclidean space En. If p and p1 are points of En such that1.1then p1 is said to be point-wise closer than p to the set A. If p is such that there is no point p1 which is point-wise closer than p to A, then p is called a closest point to the set A.
