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ncatlab.org | ||
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www.jeremykun.com
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| | | | | Last time we worked through some basic examples of universal properties, specifically singling out quotients, products, and coproducts. There are many many more universal properties that we will mention as we encounter them, but there is one crucial topic in category theory that we have only hinted at: functoriality. As we've repeatedly stressed, the meat of category theory is in the morphisms. One natural question one might ask is, what notion of morphism is there between categories themselves? | |
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rakhim.org
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| | | | | [AI summary] The article discusses the foundational concepts of category theory, its connections to logic and type theory, and how these fields are unified through shared principles of composability and universal constructions, with insights into their implications for programming and mathematics. | |
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qchu.wordpress.com
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| | | | | Let $latex k$ be a commutative ring. A popular thing to do on this blog is to think about the Morita 2-category $latex \text{Mor}(k)$ of algebras, bimodules, and bimodule homomorphisms over $latex k$, but it might be unclear exactly what we're doing when we do this. What are we studying when we study the Morita... | |
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bartoszmilewski.com
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| | | This is part 9 of Categories for Programmers. Previously: Functoriality. See the Table of Contents. So far I've been glossing over the meaning of function types. A function type is different from other types. Take Integer, for instance: It's just a set of integers. Bool is a two element set. But a function type a->b... | ||
