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Dual object
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Dual object : ウィキペディア英語版
Dual object
In category theory, a branch of mathematics, it is possible to define a concept of dual object generalizing the concept of dual space in linear algebra.
A category in which each object has a dual is called autonomous or rigid.
==Definition==

Consider an object X in a monoidal category (\mathbf,\otimes, I, \alpha, \lambda, \rho). The object X^
* is called a left dual of X if there exist two morphsims
:\eta:I\to X\otimes X^
*, called the coevaluation, and \varepsilon:X^
*\otimes X\to I, called the evaluation,
such that the following two diagrams commute
The object X is called the right dual of X^
*. Left duals are canonically isomorphic when they exist, as are right duals. When ''C'' is braided (or symmetric), every left dual is also a right dual, and vice versa.
If we consider a monoidal category as a bicategory with one object, a dual pair is exactly an adjoint pair.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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