High Quality Content by WIKIPEDIA articles! In category theory, a branch of mathematics, a pullback (also called a fibered product or Cartesian square) is the limit of a diagram consisting of two morphisms f : X ? Z and g : Y ? Z with a common codomain; it is the limit of the cospan X rightarrow Z leftarrow Y. The pullback is often written P = X times_Z Y., In mathematics, category theory deals in an abstract way with mathematical structures and relationships between them: it abstracts from sets and functions to objects linked in diagrams by morphisms or arrows.

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