Oct 31, 2016 · In this paper we study the existence of homomorphisms G\to H using semidefinite programming. Specifically, we use the vector chromatic number of a graph.

In this paper we study the existence of homomorphisms G → H using semidefinite programming. Specifically, we use the vector chromatic number of a graph, ...

Intuitively, a core is a graph G in which every homomorphism ϕ : V (G) → V (G) is an automorphism. Using this relationship, several families of graphs,.

A graph vertex coloring is an assignment of labels, which are referred to as colors, such that no two adjacent vertices receive the same color.

In this paper we study the existence of homomorphisms G → H using semidefinite programming. Specifically, we use the vector chromatic number of a graph, ...

Dec 12, 2016 · We use vector colorings to study graph homomorphisms between two undirected graphs $G$ and $H$, that satisfy $\chi_v(G)=\chi_v(H)$. The case $H= ...

Abstract. In this paper we study the existence of homomorphisms G → H us- ing semidefinite programming. Specifically, we use the vector chromatic.

In this paper we study the existence of homomorphisms $G\to H$ using semidefinite programming Specifically, we use the vector chromatic number of a graph, ...

Graph homomorphisms via vector colorings. https://doi.org/10.1016/j.ejc.2019.04.001 · Full text. Journal: European Journal of Combinatorics, 2019, p. 244-261.

Graph Homomorphisms via Vector Colorings by Chris Godsil, David E. Roberson, Brendan Rooney, Robert Šámal, Antonios Varvitsiotis published in.