摘要
We prove that G(x, y) = vertical bar integral(x)(y) f(t)dt vertical bar is multiplicatively concave on [a, b] x [a, b] if f : [a, b] subset of (0, infinity) -> (0, infinity) is continuous and multiplicatively concave.
- 出版日期2010
- 单位浙江广播电视大学; 湖州师范学院