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12 changes: 12 additions & 0 deletions trees/cat-0004.tree
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\title{cartesian closed category}
\taxon{definition}
\author{dannypsnl}
\date{2023-10-24}

\p{
一個[範疇](cat-0001) #{C} 被稱為 cartesian closed 表示
\ol{
\li{任意有限多個 objects #{\{a_i \mid i \in \mathbb{N}\}} 的 product #{a_0 \times ... \times a_n} 亦是範疇的 object}
\li{對所有 object #{a \in C} 而言,functor #{a \times - : C \to C} 是 #{(-)^a : C \to C} 的[右伴隨](https://en.wikipedia.org/wiki/Adjoint_functors)}
}
}