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Furthermore, we describe the De Morgan algebras with Boolean congruence lattices by using the notion of the minimal quotient.

以弱射影为工具,得到了De Morgan代数的主同余关系的刻划,在此基础上证明了同余格θ(L)为原子的充要条件是L为弱原子的,然后通过引进极小商的概念,描绘了θ(L)是布尔格的De Morgan代数L。

Through a case study of the pedlars,this paper points out that they have selected the survival in the narrow margins of the country and the society due to the survival pressure and the marketing-stimulating factors.

以小商贩为个案进行分析,指出由于生存性压迫及市场激励因素的影响,他们选择了在国家与社会裂缝中生存。