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01E534S1678

Name: T31A33 2012-03-21 2:32

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Name: Anonymous 2013-09-01 2:11


For every three objects X, Y, and Z, there exists a binary operation hom(X, Y) × hom(Y, Z) → hom(X, Z) called composition. The composite of f : X → Y and g : Y → Z is written g ∘ f or gf. The composition of morphisms is often represented by a commutative diagram. For example,

Name: Anonymous 2013-09-01 2:21



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Name: Anonymous 2013-09-01 2:57


Diagonal functor: The diagonal functor is defined as the functor from D to the functor category DC which sends each object in D to the constant functor at that object.

Name: Anonymous 2013-09-01 10:29


Since cardinality is such a common concept in mathematics, a variety of names are in use. Sameness of cardinality is sometimes referred to as equipotence, equipollence, or equinumerosity. It is thus said that two sets with the same cardinality are, respectively, equipotent, equipollent, or equinumerous.

Name: Anonymous 2013-09-01 11:15


    * Enumerable: lowest, intermediate, and highest

    * Innumerable: nearly innumerable, truly innumerable, and innumerably innumerable

    * Infinite: nearly infinite, truly infinite, infinitely infinite

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