高考问答假面骑士剑joker:什么是代数中的field,ring,group,semigroup,要英文的定义和英文的例子，急用！
来源：百度文库 编辑：高考问答 时间：2024/05/04 19:48:53
field 域
a space on which something is drawn or projected
numeric field form 数域形式
basic field 基本域
ring 环
a circular band for holding, connecting, hanging, pulling
unit element of ring 环单位元
ring of sets 集(合)环
group 群
two or more figures forming a complete unit in a composition
group-matrix 群阵
projective homology group 射影同调群
semigroup 半群
a mathematical set that is closed under an associative binary operation
endomorphism semigroup 自同态半群
ordered semigroup 有序半群