nLab: Natural Transformation
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The nLab wiki entry defining natural transformations between functors, with component and naturality-square formulations, vertical and horizontal composition, and links to 2-categorical generalizations. Best used as a precise reference once the basic definitions of category and functor are familiar.
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nLab
Collaborative wiki for mathematics, physics and philosophy written from a category-theoretic viewpoint, with cross-linked entries on categories, functors, adjunctions, topos theory, higher category theory and homotopy theory. Readers can look up precise definitions, examples and references for advanced structural mathematics.