K-Divisibility and a Theorem of Lorentz and Shimgaki
The Brudnyi-Krugljak theorem on the K-divisibility of Gagliardo couples is derived by elementary means from earlier results of Lorentz-Shimogaki on equimeasurable rearrangements of measurable functions. A slightly stronger form of Calder6n's theorem describing the Hardy-Littlewood-Polya relation in terms of substochastic operators (which itself generalizes the classical Hardy Littlewood-Polya result for substochastic matrices) is obtained
Published in Proceedings of the American Mathematical Society, Volume 96, Issue 4, 1986, pages 585-592.
© Proceedings of the American Mathematical Society 1986, American Mathematical Society
Bennett, C., & Sharpley, R. (1986). K-Divisibility and a Theorem of Lorentz and Shimogaki. Proceedings of the American Mathematical Society, 96(4), 585-592. doi:10.2307/2046308