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- polycyclic semigroup 多循环半群
- The latter two published a monograph on semigroup theory in 1961. 后面二人在 1961 年出版了半群理论的专论。
- A construction theorem for such semigroup is obtained. 给出该类半群的一个构造定理.
- Polycyclic aromatic hydrocarbons are a group of ubiquitous pollutants. 摘要多环芳烃是一类普遍存在的环境污染物。
- It follows that every nonempty periodic semigroup has at least one idempotent. 得出了所有非空周期半群都有至少一个幂等元。
- A semigroup generated by a single element is said to be monogenic (or cyclic ). 被一个单一元素生成的半群叫做 单基因 的(或 循环 的)。
- The minimal ideal of a commutative semigroup, when it exists, is a group. 交换半群的极小理想如果存在的话是个群。
- A semigroup is said to be periodic if all of its elements are of finite order. 半群被称为 周期性 的,如果所有它的元素有着有限次序。
- On Earth, polycyclic aromatic hydrocarbons are found on burnt toast and in automobile exhaust. 在地球上,可以在烤土司和汽车尾气中找到多环芳烃。
- In species of Pinus which are polycyclic flower initiation must occur over a wide time range. 具有多环球花的松树属种,其花的孕育期会延续较长的时间。
- In species of pines which are polycyclic flower initiation must occur over a wide time range. 具有多环球花的松树属种,其花的孕育期会延续较长的时间。
- Incense is burnt in many Chinese homes and polycyclic aromatic hydrocarbons have been recovered from incense smoke. 很多中国人家里点香,香的烟中已经发现有多环芳香族碳氢化合物。
- Nitrated Polycyclic aromatic hydrocarbons are a class of important pollutants with direct mutagenicity. 硝基多环芳烃是一类重要的具有直接致突变性的环境污染物。
- For example, every nonempty finite semigroup is periodic, and has a minimal ideal and at least one idempotent. 例如,所有非空有限半群是周期性的,并有一个极小理想和至少一个幂等元。
- The polycyclic aromatic hydrocarbons(PAHs) in soil have serious latent danger to our human health. 土壤中的多环芳烃对人体健康具有潜在的危害。
- Then,two important structural theorem are obtained by the special structure of Clifford semigroup. 其次,根据C lifford半群是群强半格的特殊结构,得到了C lifford半群的幂半群的两个重要的结构定理。
- The polycyclic development of geosynclinal belts is controlled by the cyclicity of subduction during e geological time. 地质时期地槽的多旋回发展受到俯冲作用旋回的控制。
- Polycyclic aromatic compounds which are widespread in water, soil and atmosphere are harmful to human health. 摘要多环芳香化合物广泛分布于水体、土壤和大气中,对人类的健康造成了严重的危害。
- If S is a semigroup, then the intersection of any collection of subsemigroups of S is also a subsemigroup of S. 如果 S 是半群,则任何 S 的子半群的搜集的交集也是 S 的子半群。
- A semigroup S is called 2-semiband, if every element of S is a product of two idempotents of S. 摘要称半群S为2-半带,若其中每个元素都可以写为S中两个幂等元的积。