# Answer to Question #36126 in Other Math for matthew lind

Question #36126

Definition: Given any non-empty closed convex set C and an arbitrary vector x in R^j, there is a unique member Pcx of C closest, in the sense of the two norm, to x. The vector Pcx is called the orthogonal projection of x onto C and the operator Pc the orthogonal projection onto C.

Question: Given a point s in a convex set C, where are the points x for which s = Pcx?

Question: Given a point s in a convex set C, where are the points x for which s = Pcx?

Expert's answer

In this case the vector and its orthogonal projection onto C coincide.

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