The existence of continuous selections is proved for a class of lower semicontinuous multifunctions whose values are closed convex subsets of a complete metric space equipped with an appropriate notion of convexity. The approach is based on the notion of pseudo-barycenter of an ordered n-tuple of points.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ba52-3-10,
author = {F. S. De Blasi and G. Pianigiani},
title = {Continuous Selections in $\alpha$-Convex Metric Spaces},
journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
volume = {52},
year = {2004},
pages = {303-317},
zbl = {1101.54022},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba52-3-10}
}
F. S. De Blasi; G. Pianigiani. Continuous Selections in α-Convex Metric Spaces. Bulletin of the Polish Academy of Sciences. Mathematics, Tome 52 (2004) pp. 303-317. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba52-3-10/