2 papers
math.MG2008
A.D. Alexandrov's problem for Busemann non-positively curved spaces
P. D. Andreev
The paper is the last in the cycle devoted to the solution of Alexandrov's problem for non-positively curved spaces. Here we study non-positively curved spaces in the sense of Buse…
math.GT2003
A characterization of isometries of CAT(0)-space as maps preserving diagonal tube
Pavel Andreev
We give positive answers for questions by Berestovskii. Namely, we prove that every bijection of locally compact geodesically complete and connected at infinity CAT(0)-space on…