Abstract Homotopy Theory
Abstract Homotopy Theory is a scholarly work by Edgar H. Brown, published in 1965 in ''Transactions of the American Mathematical Society''. The main subjects of the publication include homotopy, cluster algebra, mathematics, covariance and contravariance of vectors, functor, pure mathematics, natural transformation, deformation quantization, Whitehead theorem, homotopy category, subcategory, morphism, base, commutative ring, discrete mathematics, homotopy theory, and model category. Introduction.Let "^ be a category and let Sf be the category of sets and set maps.If X and Y are objects in <€, \X, Y~] will denote the set of morphisms from X to Y.