Dualities of concrete categories
Hans-E. Porst (1976)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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Displaying similar documents to “Final Dialgebras: From Categories to Allegories”
Dualities of concrete categories
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The main purpose of this article is to introduce the categorical concept of pullback in Mizar. In the first part of this article we redefine homsets, monomorphisms, epimorpshisms and isomorphisms [7] within a free-object category [1] and it is shown there that ordinal numbers can be considered as categories. Then the pullback is introduced in terms of its universal property and the Pullback Lemma is formalized [15]. In the last part of the article we formalize the pullback of functors...
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