منابع مشابه
Kan Extensions of Institutions
Institutions were introduced by Goguen and Burstall 8, 9, 10, 11] to formally capture the notion of logical system. Interpreting institutions as functors, and morphisms and representations of institutions as natural transformations, we give elegant proofs for the completeness of the categories of institutions with morphisms and representations, respectively, show that the duality between morphi...
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We describe a new extension of the Todd–Coxeter algorithm adapted to computing left Kan extensions. The algorithm is a much simplified version of that introduced by Carmody and Walters (Category Theory, Proceedings of the International Conference Held in Como, Italy, 22–28 July 1990. Springer) in 1991. The simplification allows us to give a straightforward proof of its correctness and terminati...
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An existing procedure to compute left Kan extensions over the ground category Set also computes left Kan extensions over the ground categories Cat, 2-Cat, n-Cat for any n and indeed !-Cat. Therefore extension data struc-tured in this manner already can make use of the left Kan extension notion of a best possible approximation. Examples include systems of labeled transition systems and certain h...
متن کاملKan Extensions of Institutions
Institutions were introduced by Goguen and Burstall [GB84, GB85, GB86, GB92] to formally capture the notion of logical system. Interpreting institutions as functors, and morphisms and representations of institutions as natural transformations, we give elegant proofs for the completeness of the categories of institutions with morphisms and representations, respectively, show that the duality bet...
متن کاملThe Norwegian type-anaphor det
This paper gives a description of the Norwegian type anaphor det ('that') and proposes a formal representation of it in the HPSG framework. This identity-of-sense anaphor is interpreted as referring to a (new) set of entities of the same type as its antecedent. Its antecedent has to be either indefinite or a definite NP that is likely to introduce a brand new discourse referent. Whereas the typ...
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ژورنال
عنوان ژورنال: Plan
سال: 2006
ISSN: 1504-3045,0805-083X
DOI: 10.18261/issn1504-3045-2005-06-01