## The non-increasing rearrangement as extremal function.(English)Zbl 0337.26007

Report. No. 7. Umea; Sweden: University of Umea, Department of Mathematics. 16 p. (1974).

### MSC:

 26D15 Inequalities for sums, series and integrals 26A51 Convexity of real functions in one variable, generalizations 26A15 Continuity and related questions (modulus of continuity, semicontinuity, discontinuities, etc.) for real functions in one variable 46E30 Spaces of measurable functions ($$L^p$$-spaces, Orlicz spaces, Köthe function spaces, Lorentz spaces, rearrangement invariant spaces, ideal spaces, etc.) 28A20 Measurable and nonmeasurable functions, sequences of measurable functions, modes of convergence