![]() ![]() ![]() Categories for the Working Mathematician begins with foundations, illuminating concepts such as category, functor, natural transformation, and duality. Next comes the fundamental idea of an adjoint pair of functors. These notions are presented, with appropriate examples, in Chapters I and II. On the first level, categories provide a convenient conceptual language, based on the notions of category, functor, natural transformation, contravariance, and functor category. One is on symmetric monoidal categories and braided monoidal categories and the coherence theorems for them-items of interest in their own right and also in view of their use in string theory in quantum field theory. This second edition of 'Categories Work' adds two new chapters on topics of active interest.
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