Книга: Pullback (category theory): Category Theory, Mathematics, Limit, Diagram, Morphism, Span, Commutative Diagram

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.