Duality Theorems for Finite Structures (Characterising Gaps and Good Characterisations)
نویسندگان
چکیده
منابع مشابه
Duality Theorems for Finite Structures (Characterising Gaps and Good Characterisations)
We provide a correspondence between the subjects of duality and density in classes of finite relational structures. The purpose of duality is to characterise the structures C that do not admit a homomorphism into a given target B by the existence of a homomorphism from a structure A into C. Density is the order-theoretic property of containing no covers (or ‘gaps’). We show that the covers in t...
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ژورنال
عنوان ژورنال: Journal of Combinatorial Theory, Series B
سال: 2000
ISSN: 0095-8956
DOI: 10.1006/jctb.2000.1970