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nLab is a collaborative, wiki-style knowledge base focused on category theory and related areas, offering definitions, explanations, examples, and discussions of higher category theory, topology, logic, and beyond. It contains pages on core concepts (categories, monoidal and higher categories, topos, operads), plus references and links to literature for deeper reading.
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Category Theory Introduction
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Category Theory for Programmers: Part 1
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Lectures on Category Theory
Learn category theory from Tom Leinster's lectures! This course explores categories, functors, and natural transformations.
