Geodesic
A sharpening of a discrete analog of Wirtinger's and isoperimetric inequalities
Mathematica Bohemica, Tome 117 (1992) no. 4, pp. 425-428.

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A sharpening of a discrete case of Wirtinger's inequality is given. It is then used to sharpen the isoperimetric unequality for polygons.
DOI : 10.21136/MB.1992.126056
Classification : 51M16, 52A40
Keywords: closed $n$-gons; inequalities; Wirtinger's inequality; trigonometric polynomials 
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Pech, Pavel. A sharpening of a discrete analog of Wirtinger's and isoperimetric inequalities. Mathematica Bohemica, Tome 117 (1992) no. 4, pp. 425-428. doi : 10.21136/MB.1992.126056. http://geodesic.mathdoc.fr/articles/10.21136/MB.1992.126056/

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