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math.CO2014★ 3 cited
Graph Relations and Constrained Homomorphism Partial Orders
Yangjing Long
We consider constrained variants of graph homomorphisms such as embeddings, monomorphisms, full homomorphisms, surjective homomorpshims, and locally constrained homomorphisms. We a…
math.CO2014
Universality of intervals of line graph order
Jiří Fiala, Jan Hubička, Yangjing Long
We prove that for every the homomorphism order of the class of line graphs of finite graphs with maximal degree is universal. This means that every finite or countabl…