环 (代数) Ring (mathematics)
（重定向自Unit element）
环（Ring）的定义类似于可交换群，只不过在原来「+」的基础上又增添另一种运算「·」（注意我们这里所说的 + 与 · 一般不是我们所熟知的四则运算加法和乘法）。在抽象代数中，研究环的分支为环论。
Unit element
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Ring (mathematics) 环 (代数)
（重定向自Unit element）
In mathematics, a ring is one of the fundamental algebraic structures used in abstract algebra. It consists of a set equipped with two binary operations that generalize the arithmetic operations of addition and multiplication. Through this generalization, theorems from arithmetic are extended to non-numerical objects such as polynomials, series, matrices and functions.
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