共查询到3条相似文献,搜索用时 0 毫秒
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Daniel Krob 《Semigroup Forum》1987,36(1):323-339
We study some algebraic properties of complete semi-rings. The underlying monoids of such semi-rings are specially studied. 相似文献
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Paul Blanchard 《Semigroup Forum》1991,43(1):218-246
We study some syntactic properties of languages obtained from rational languages through counting operations. These counting operations use the congruences-threshold p, modulo n—on the set of integers. We show that in some cases they preserve the properties of syntactic monoids: the structure of idempotent and commutative monoids is not modified, aperiodic monoids with central idempotents keep their central idempotents and their regular D-classes still are groups although not trivial, aperiodic left (right) nilsimple semigroups still have regular R (L)-classes which are (non trivial) groups. If possible results are expressed in terms of varieties of semigroups or monoids. 相似文献