Structures and properties of quasi-commutative chained semigroups are studied.
研究了拟交换链半群的结构和性质。
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。
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。
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