Abstract
In this little note I first recall a particularly short proof of the classical isoperimetric inequality in two dimensions. Other geometric inequalities are still open in more than two dimensions. I point out six of those.
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This manuscript is dedicated to Ernst-Ulrich Gekeler with gratitude for his service to Archiv der Mathematik.
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Kawohl, B. Two dimensions are easier. Arch. Math. 107, 423–428 (2016). https://doi.org/10.1007/s00013-016-0953-8
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DOI: https://doi.org/10.1007/s00013-016-0953-8