0
2013
Impact Factor

# Ruslan Pepa

## Publications:

 Pepa R. Y., Popelensky T. Y. Equilibrium for a Combinatorial Ricci Flow with Generalized Weights on a Tetrahedron 2017, vol. 22, no. 5, pp.  566-578 Abstract Chow and Lou [2] showed in 2003 that under certain conditions the combinatorial analogue of the Hamilton Ricci flow on surfaces converges to Thruston’s circle packing metric of constant curvature. The combinatorial setting includes weights defined for edges of a triangulation. A crucial assumption in [2] was that the weights are nonnegative.We have recently shown that the same statement on convergence can be proved under weaker conditions: some weights can be negative and should satisfy certain inequalities. In this note we show that there are some restrictions for weakening the conditions. Namely, we show that in some situations the combinatorial Ricci flow has no equilibrium or has several points of equilibrium and, in particular, the convergence theorem is no longer valid. Keywords: circle packing, combinatorial Ricci flow Citation: Pepa R. Y., Popelensky T. Y.,  Equilibrium for a Combinatorial Ricci Flow with Generalized Weights on a Tetrahedron, Regular and Chaotic Dynamics, 2017, vol. 22, no. 5, pp. 566-578 DOI:10.1134/S1560354717050070