on the teaching of the criterion for relative extrema for multible functions of variables 关于多元函数极值的判别方法的教学
the distribution for function of variables is an important but difficult to be mastered course 摘要随机变量函数的分布是数学系概率统计课程教学中的一个重点和难点。
in operations research, a procedure for locating the maximum or minimum of a linear function of variables that are subject to linear constraints 在运筹学中,找出受线性约束的变量的线性函数的最大值或最小值的过程。
pseud-sliding mode control in srd is lucubrated, the control law and the switch function of variable-structure control system with sliding mode ( vss ) are designed, the choice of the parameters of pi control and the theory of the combination control are discussed 实验结果表明准滑模变结构控制策略具有良好的动态性能和稳态性能,同时可以削弱传统滑模控制的抖振影响,验证了理论分析和数字仿真的正确性。
since 1970s financial innovation has been developed rapidly for the integration of many factors, such as development in science-technology, financial deregulation, intensified competition between the financial institutions and pursuing profits of financial enterprises . financial innovation brings a challenge to traditional monetary policy . it changes the function of variables in money demand function 二十世纪70年代以来,金融创新得到了飞速的发展,这是多种因素汇合的结果,究其原因,有科学技术的迅速发展,有金融管制的放松,有金融机构竞争的加剧,还有金融企业自身对利润的追求等。