random graphs;
graph homomorphisms;
projective graphs;
D O I:
10.1002/jgt.20017
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
We show that all graphs with a simple extension property are projective. As a consequence of this result we settle in the affirmative a conjecture of Larose and Tardif and characterize all homogeneous graphs which are projective. (C) 2004 Wiley Periodicals, Inc.