Wei Baojun
Abstract
In this paper,definttion 3 equivalent to 1 was given to the lack of the definetion of Concave function;According to the necessary and sufficient condition of Concave function,weak sufficient conditions are given for judging the Convex-concave function.
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In this paper,definttion 3 equivalent to 1 was given to the lack of the definetion of Concave function;According to the necessary and sufficient condition of Concave function,weak sufficient conditions are given for judging the Convex-concave function.
Key concepts: Concave function, Equivalence (formal languages), Mathematics, Function (biology), Regular polygon, Pure mathematics, Geometry, Evolutionary biology