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Cartesian monoidal category : ウィキペディア英語版
Cartesian monoidal category

In mathematics, specifically in the field known as category theory, a monoidal category where the monoidal ("tensor") product is the categorical product is called a cartesian monoidal category. Any category with finite products (a "finite product category") can be thought of as a cartesian monoidal category. In any cartesian monoidal category, the terminal object is the tensor unit. Dually, a monoidal finite coproduct category with the monoidal structure given by the coproduct and unit the initial object is called a cocartesian monoidal category, and any finite coproduct category can be thought of as a cocartesian monoidal category.
Cartesian categories with a Hom functor that is an adjoint functor to the product are called Cartesian closed categories.
== Properties ==
Cartesian monoidal categories have a number of special and important properties, such as the existence of diagonal maps Δ''x'' : ''x'' → ''x'' ⊗ ''x'' and augmentations ''e''''x'' : ''x'' → ''I'' for any object ''x''. In applications to computer science we can think of Δ as ‘duplicating data’ and ''e'' as ‘deleting’ data. These maps make any object into a comonoid. In fact, any object in a cartesian monoidal category becomes a comonoid in a unique way.

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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