Journal of Guangxi Normal University(Natural Science Edition) ›› 2010, Vol. 28 ›› Issue (2): 27-29.

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Equivalence Definition and Criteria on Concave Function

ZHANG Wu-jun, WEI Bao-jun   

  1. School of Sciences,Information Engineering University,Zhengzhou Henan 450002,China
  • Received:2009-12-15 Online:2010-06-20 Published:2023-02-07

Abstract: In this paper,definttion 3 equivalent to 1 was given to the lack of the definetion of Concave function;According to the necessaryand sufficient condition of Concave function,weak sufficient conditions are given for judging the Convex-concave function.

Key words: concave function, left and right derivative, criteriontheorem

CLC Number: 

  • O172
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