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Basic properties of the dense sub-semigroups in commutative groups are studied.
引入了可换群的稠密子群，并研究了它的基本性质。
youdao
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The groups of the solvable equations are commutative .
可解方程的群都是交换群。
youdao
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The groups of the solvable equations are commutative .
可解方程的群都是交换群。
youdao