Mathematics – Logic
Scientific paper
1998-09-15
Mathematics
Logic
Scientific paper
We apply model theoretic methods to the problem of existence of countable universal graphs with finitely many forbidden connected subgraphs. We show that to a large extent the question reduces to one of local finiteness of an associated''algebraic closure'' operator. The main applications are new examples of universal graphs with forbidden subgraphs and simplified treatments of some previously known cases.
Cherlin Gregory
Shelah Saharon
Shi Niandong
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