Geodesic
A General Integral Inequality for the Derivative of an Equimeasurable Rearrangement
Canadian journal of mathematics, Tome 28 (1976) no. 4, pp. 793-804

Voir la notice de l'article provenant de la source Cambridge University Press

The theory of non-increasing (decreasing) equimeasurable rearrangements of functions was introduced by Hardy and Littlewood [6] in connection with their studies of fractional integrals and integral operators. Elementary properties of equimeasurable decreasing rearrangements are given in the monograph [7] of Hardy, Littlewood, and Polya on inequalities, while a more recent treatment is Okikiolu [9, § 5.4]. 
Duff, G. F. D. A General Integral Inequality for the Derivative of an Equimeasurable Rearrangement. Canadian journal of mathematics, Tome 28 (1976) no. 4, pp. 793-804. doi: 10.4153/CJM-1976-076-0
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