Article: A note on an Ostrowski type inequality *.(Report)

As the first main result in (1), G.A. Anastassiou presented the following Ostrowski type inequality.

Theorem A. Let f: [a, b] [right arrow] R be 3-times differentiable on (a, b) whose third derivative f''': (a, b) [right arrow] R is bounded on (a, b), i.e., [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]. Then we have the inequality

[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]

for every x [member of] [a, b], where

A(x): = [abx.sup.4] - [[1/3][a.sup.2][b.sup.3]x] + [[1/3][a.sup.3][bx.sup.2]] - [[ab.sup.2][x.sup.3]] - [[1/3][a.sup.3][b.sup.2]x] + [[1/3][ab.sup.3][x.sup.2]] + [[a.sup.2][b.sup.2][x.sup.2]] - [[a.sup.2][bx.sup.3]] - [[1/2][ax.sup.5]] - ...

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