Dr. Evgenii N. Sosov
Doctor of Science
1) Main metric invariants of finite metric spaces;
2) Convex and finite sets of geodesic spaces;
3) The action of the multiplicative group of nonzero real numbers on the pointed Lobachevsky space;
4) The best net, the best section, and the Chebyshev center of bounded set in special metic space (and in infinite-dimensional Lobachevskii space).