【摘要】 首先,定义了一类广义凸集——半p-不变凸集,在此基础之上,利用半预不变凸函数和(p,r)-预不变凸函数,定义了一类新的广义凸函数——半(p,r)-(预)不变凸函数,并举例说明了它既是半预不变凸函数又是(p,r)-预不变凸函数的真推广,从而是熟知的凸函数和不变凸函数的推广形式.接着,介绍了一个广义Lagrange向量函数L(x,u).最后,利用半(p,r)-不变凸函数讨论了多目标分式规划问题的鞍点最优性条件,得到了几个鞍点的存在性定理,其结论窟有一般性,推广了许多涉及不变凸函数,半预不变凸函数和(p,r)-(预)不变凸函数的文献的结论.更多还原

【Abstract】 First,a class of generalized convex set called semi p-invex set is defined and based on this,by using semi-preinvexity functions and (p,r)-preinvexity functions,a class of new generalized convex functions called semi(p,r)-(pre)invexity functions are defined.It is showed with the aid of some examples that it is real generalization of the semi-preinvexity functions and(p,r)-preinvexity functions,thus it is the generalization of well known convexity functions and invexity functions.Second,a vector-valued lagrangian L(x,u) is introduced.At last,by using semi(p,r)-invexity functions,the saddle point optimality conditions of a multiobjective fractional programming problem are studied,and some existence theorems for saddle point are derived.The work generalizes many results on programming problems with invex functions and semi-preinvexity functions,(p,r)-(pre)invex functions.更多还原