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Turkish Journal of Mathematics

DOI

10.3906/mat-1504-12

Abstract

In this paper, we first introduce the $k$-order radial function $\rho_k(\theta)$ for star-shaped curves in $\mathbb{R}^2$ and then prove a geometric inequality involving $\rho_k(\theta)$ and the area $A$ enclosed by a star-shaped curve, which can be looked upon as the dual Chernoff--Ou--Pan inequality. As a by-product, we get a new proof of the classical dual isoperimetric inequality. We also prove that $\frac{C^2}{k^2}\leq A

Keywords

Star curves, the dual Chernoff--Ou--Pan inequality, equichordal curves

First Page

272

Last Page

282

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Mathematics Commons

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