Loewner's Torus Inequality

In differential geometry, Loewner's torus inequality is an inequality due to Charles Loewner. It relates the systole and the area of an arbitrary Riemannian metric on the 2-torus.

Read more about Loewner's Torus Inequality:  Statement, Case of Equality, Alternative Formulation, Proof of Loewner's Torus Inequality, Higher Genus

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    The doctrine of equality!... But there exists no more poisonous poison: for it seems to be preached by justice itself, while it is the end of justice.... “Equality for equals, inequality for unequals”Mthat would be the true voice of justice: and, what follows from it, “Never make equal what is unequal.”
    Friedrich Nietzsche (1844–1900)