back cone distance

Recently using the middle point of the curve as the pision point has been applied practically.

在现行的分割方法中,常常取中点作为其分割点,执行效率较高,但有时还是不能达到容许误差要求,这就需要再次分割。

The paper establishes the relationship between order and middle point in De Morgan algebras.

首先给出了De Morgan代数的阶与中点个数的关系,证明了五元非全序的De Morgan代数不存在,以及在同构的意义下七元非全序的De Morgan代数有且只有1个。

Through investigating the order structure of non-totally ordered R_0-algebra, this is given that the definition of middle point and obtains a partition of the set of R_0-algebras by making use of middle point.

通过考察非全序R0代数的序结构,给出了中点的定义,并利用中点给出R0代数的一个分划,同时证明了五元和七元非全序R0代数不存在,以及n元(n>7)非全序R0代数的存在性,并推广到无限元的情形,得到了构造可去(加)中点的非全序R0代数的两种方法。