Dalmau, V. and Krokhin, A. and Larose, B. (2004) 'First-order definable retraction problems for posets and reflexive graphs.', in 19th annual IEEE symposium on logic in computer science, LICS'04, 13-17 July 2004, Turku, Finland ; proceedings. , pp. 232-241.
A retraction from a structure P to its substructure Q is a homomorphism from P onto Q that is the identity on Q. We present an algebraic condition which completely characterises all posets and all reflexive graphs Q with the following property: the class of all posets or reflexive graphs, respectively, that admit a retraction onto Q is first-order definable.
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|Last Modified:||14 Dec 2011 09:59|
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