###### Dr. Krakovski Roi

###### Fields of Research

## Short Bio

Roi received his Ph.D. degree in computer science from Ben-Gurion University. He was a postdoctoral researcher at Simon Fraser University. He then joined IBM Research labs in Haifa as a Machine Learning researcher and was a member of the Invention, Development and Technology Committee. Roi is a researcher in the field of graph theory and algorithms with more than 20 publications.

## Selected Publications

**"An analogue of Bridges and Mena's theorem for local elds and a local-global principle"**, Linear. Alg. Appl 438: 342-347 (2013).(with M. Devos, B. Mohar and A. S. Ahmady)

**"Integral Cayley multigraphs over Abelian and Hamiltonian groups"**, Electr. J. Comb. 20(2):P63 (2013),**"Topological minors in line graphs: A proof of Zha's conjecture"**, Combinatorica 34(2): 207-252 (2014).(with B.Mohar)

**"Homological Face-width conditions guaranteeing K6-minors in graphs on surfaces"**, SIAM J. Discrete Math. 28(3): 1257-1275 (2014).(with U. Onn and P. Singla)

**"Regular characters of groups of type An over discrete valuation rings"**, J. Algebra 496: 116-137 (2018)