借助近似代数上的原子及同余关系，证明了在适当选取余运算之后，粗集代数就构成伪补MS代数。
Based on the atoms and congruence relations of approximation algebra, it is proved that rough set algebra becomes pseudo-complemented ms algebra if proper complement operators are selected.
本文提出伪补MS-代数（简称PMS-代数）中正则理想，正则同余关系等概念。
In this paper, we introduce notions of regular ideals of a pseudocomplemented MS-algebra (PMS-algebra, for short) and study their elementary properies.
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