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商结构

在较抽象的数学，特别是抽象代数中，商通常用以描由某类集合、空间或代数结构上由合适的等价关系定出的新结构，其元素通常是原集合的等价类。在范畴论中，则进一步将之抽象为一范畴中的商对象。详阅：

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代数结构 · 群 · 环 · 域 · 有限域 · 本原元 · 格 · 逆元 · 等价关系 · 代数中心 · 同态 · 同构 · 商结构（商系统） · 同构基本定理 · 自由对象
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商结构
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