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  2. Category (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Category_(mathematics)

    Examples include Set and CPO, the category of complete partial orders with Scott-continuous functions. A topos is a certain type of cartesian closed category in which all of mathematics can be formulated (just like classically all of mathematics is formulated in the category of sets). A topos can also be used to represent a logical theory.

  3. Categorical theory - Wikipedia

    en.wikipedia.org/wiki/Categorical_theory

    A theory is κ-categorical (or categorical in κ) if it has exactly one model of cardinality κ up to isomorphism. Morley's categoricity theorem is a theorem of Michael D. Morley ( 1965 ) stating that if a first-order theory in a countable language is categorical in some uncountable cardinality , then it is categorical in all uncountable ...

  4. Category theory - Wikipedia

    en.wikipedia.org/wiki/Category_theory

    Examples include quotient spaces, direct products, completion, and duality. Many areas of computer science also rely on category theory, such as functional programming and semantics . A category is formed by two sorts of objects : the objects of the category, and the morphisms , which relate two objects called the source and the target of the ...

  5. Timeline of category theory and related mathematics - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_category...

    Abstract geometry, including algebraic geometry, categorical noncommutative geometry, etc. Quantization related to category theory, in particular categorical quantization; Categorical physics relevant for mathematics. In this article, and in category theory in general, ∞ = ω.

  6. Glossary of category theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_category_theory

    This is a glossary of properties and concepts in category theory in mathematics. (see also Outline of category theory.). Notes on foundations: In many expositions (e.g., Vistoli), the set-theoretic issues are ignored; this means, for instance, that one does not distinguish between small and large categories and that one can arbitrarily form a localization of a category. [1]

  7. Equivalence of categories - Wikipedia

    en.wikipedia.org/wiki/Equivalence_of_categories

    In category theory, a branch of abstract mathematics, an equivalence of categories is a relation between two categories that establishes that these categories are "essentially the same". There are numerous examples of categorical equivalences from many areas of mathematics.

  8. Monad (category theory) - Wikipedia

    en.wikipedia.org/wiki/Monad_(category_theory)

    The categorical dual definition is a formal definition of a comonad (or cotriple); this can be said quickly in the terms that a comonad for a category is a monad for the opposite category. It is therefore a functor U {\displaystyle U} from C {\displaystyle C} to itself, with a set of axioms for counit and comultiplication that come from ...

  9. Categorification - Wikipedia

    en.wikipedia.org/wiki/Categorification

    In mathematics, categorification is the process of replacing set-theoretic theorems with category-theoretic analogues. Categorification, when done successfully, replaces sets with categories, functions with functors, and equations with natural isomorphisms of functors satisfying additional properties. The term was coined by Louis Crane. [1] [2]

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