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态射
EntityQ1948412· pop 26· linked from 468 articles

Also known as arrow, 1-cell

In mathematics, a morphism is a concept of category theory that generalizes structure-preserving maps such as homomorphism between algebraic structures, functions from a set to another set, and continuous functions between topological spaces. Although many examples of morphisms are structure-preserving maps, morphisms need not be maps, but they can be composed in a way that is similar to function composition.

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Category:Morphisms
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Morphisms
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mapping
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category theory
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Article · 中文

态射(英語:Morphism)在数学中是指两个数学结构之间保持结构的一种映射。 许多当代数学领域中都有态射的身影。例如,在集合论中,态射就是函数;在群论中,它们是群同态;而在拓扑学中,它们是连续函数;在泛代数(universal algebra)的范围,态射通常就是同态。 对态射和它们定义于其间的结构(或对象)的抽象研究构成了范畴论的一部分。在范畴论中,态射不必是函数,而通常被视为两个对象(不必是集合)间的箭头。不像映射一个集合的元素到另外一个集合,它们只是表示域(domain)和陪域(codomain)间的某种关系。 尽管态射的本质是抽象的,多数人关于它们的直观(事实上包括大部分术语)来自于具体范畴的例子,在那里对象就是有附加结构的集合而态射就是保持这种结构的函数。

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