A characterization of convex subsets of normed spaces

A Fixed Point Theorem for Mappings which do not Increase Distances

W. A. Kirk · American Mathematical Monthly · 1965 · 1K citations

Natural Sciences, Computer Science, Mathematics +10

NONEXPANSIVE NONLINEAR OPERATORS IN A BANACH SPACE

Felix E. Browder · Proceedings of the National Academy of Sciences · 1965 · 958 citations · Full text

Engineering, Mechanical Engineering, Finite Element Analysis +3

A convexity in metric space and nonexpansive mappings. I.

Wataru Takahashi · Kodai Mathematical Journal · 1970 · 465 citations · Full text

Natural Sciences, Mathematics, Geometry +11

Studies in Geometry.

Hans Freudenthal, Leonard M. Blumenthal, Karl Menger · American Mathematical Monthly · 1971 · 80 citations

A fixed point theorem for nonexpansive mappings in metric space

Yōichi Kijima, Wataru Takahashi · Kodai Mathematical Journal · 1969 · 23 citations

Natural Sciences, Mathematics, Set Theory +12