On the classes of higher-order Jensen-convex functions and Wright-convex functions, II

被引:5
|
作者
Mrowiec, Jacek [1 ]
Rajba, Teresa [1 ]
Wasowicz, Szymon [1 ]
机构
[1] Univ Bielsko Biala, Dept Math, Willowa 2, PL-48309 Bielsko Biala, Poland
关键词
Higher-order; (Wright; Jensen)-convexity; Higher-order strong (Wright; Difference operator; Hamel basis;
D O I
10.1016/j.jmaa.2017.01.083
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
Recently Nikodem, Rajba and W4sowicz compared the classes of n-Wright-convex functions and n-Jensen-convex functions by showing that the first one is a proper subclass of the latter one, whenever n is an odd natural number. Till now the case of even n was an open problem. In this paper the complete solution is given: it is shown that the inclusion is proper for any natural n. The classes of strongly n-Wright-convex and strongly n-Jensen-convex functions are also compared (with the same assertion). (C) 2017 Elsevier Inc. All rights reserved.
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页码:1144 / 1147
页数:4
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