A class of super-additive functions. (English) Zbl 0050.28401

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[1] G. Pólya, Sur la fréquence fondamentale des membranes vibrantes et la résistance élastique des tiges à la torsion, C.R. Acad. Sci. Paris vol. 225, p. 347. · Zbl 0029.28201
[2] G. Pólya and G. Szegö, Isoperimetric inequalities in mathematical physics, Annals of Mathematics Studies, no. 27, p. 88. · Zbl 0044.38301
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