Alexander A. Gaifullin

Universal realisators for homology classes

We study oriented closed manifolds M^n possessing the following Universal Realisation of Cycles (URC) Property: For each topological space X and each integral homology class z of it, there exist a finite-sheeted covering \hM^n of M^n and a continuous mapping f of \hM^n to X such that f takes the fundamental class [\hM^n] to kz for a non-zero integer k. We find wide class of examples of such manifolds M^n among so-called small covers of simple polytopes. In particular, we find 4-dimensional hyperbolic manifolds possessing the URC property. As a consequence, we prove that for each 4-dimensional oriented closed manifold N^4, there exists a mapping of non-zero degree of a hyperbolic manifold M^4 to N^4. This was conjectured by Kotschick and Loeh.

Generalization of Sabitov's Theorem to Polyhedra of Arbitrary Dimensions

In 1996 Sabitov proved that the volume

Flexible cross-polytopes in spaces of constant curvature

V

Infinite symmetric group, pseudomanifolds, and combinatorial cobordism-like structures

V of an arbitrary simplicial polyhedron

THE ANALYTIC CONTINUATION OF VOLUME AND THE BELLOWS CONJECTURE IN LOBACHEVSKY SPACES

P

Small covers of graph-associahedra and realization of cycles

P in the