A somewhat unexpected concavity
The Teaching of Mathematics, Tome 2013 (2013) no. 30, p. 18.

Voir la notice de l'article dans European Digital Mathematics Library

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     author = {Aaron Melman},
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Aaron Melman. A somewhat unexpected concavity. The Teaching of Mathematics, Tome 2013 (2013) no. 30, p. 18. https://geodesic-test.mathdoc.fr/item/TM_2013__2013_30_261753/