Bryant, V. W.
The convexity of the subset space of a metric space
Compositio Mathematica, Tome 22 (1970) no. 4 , p. 383-385
Zbl 0205.27102 | MR 275293
URL stable : http://www.numdam.org/item?id=CM_1970__22_4_383_0

Bibliographie

L.M. Blumenthal [1] Distance Geometry, Oxford, 1953. MR 54981 | Zbl 0050.38502

C. Kuratowski [2] Topologie I (2nd edition), Warsaw, 1948. Zbl 0041.09603

C. Kuratowski [3] Topologie II, Warsaw, 1950. Zbl 0041.09604