non developable ruled surface

Synthesis of new cyclooxygenase-2 inhibitor:rofecoxib;

新型非甾体抗炎药COX-2抑制剂罗非可昔的合成

This paper will approach some mathematics models of generalized inverse problem according to complementary optimum condition that how to make some infeasible solutions become optimal solutions by adjusting its coefficients like products cost coefficient,resources consumption coefficient and the quantity of owning resources in linear programming for enterprise optimal production plan.

将依据互补最优性条件探讨面向企业最优生产计划的线性规划,如何通过调整其产品成本系数、资源消耗系数和资源拥有量等参数,使某些非可行解成为最优解的广义逆优化问题的数学模型。

Let G be a finite non-solvable group and Z(G)=1.

设G是有限非可解群且Z(G)=1。

In this paper, we have proved the following:Theorem Let G be a finite non-solvable group and p be the smallest odd prime divisor of the order of G.

证明了：定理设Ｇ为有限非可解群，ｐ为｜Ｇ｜的最小奇素因子。

In this paper, we give the sufficient and necessary condition for the existence of noncommutative rings of order n, and discuss the non-commutative rings of lower order.

本文给出了存在ｎ阶非可换环的充要条件，并讨论了低阶非可换环的状况。