On CLARKSON's Inequalities and Interpolation
โ Scribed by Lech Maligranda; Lars Erik Persson
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 468 KB
- Volume
- 155
- Category
- Article
- ISSN
- 0025-584X
No coin nor oath required. For personal study only.
โฆ Synopsis
Abstract
We consider some elementary proofs of local versions of CLARKSON's inequalities and point out the fact that these inequalities can be generalized to hold for a much wider class of parameters. In particular it is easy to generalize our interpolation proof in various ways to higher dimensions. We point out explicitely some examples of such generalizations and we also prove some corresponding global versions. In this elementary way we obtain both new proofs of some previous results of this kind and also some new complements, unifications and further generalizations of these results.
๐ SIMILAR VOLUMES
## Abstract The best constant in a generalized complex Clarkson inequality is __C__~__p,q__~ (โ) = max {2^1โ1/__p__^ , 2^1/__q__^ , 2^1/__q__ โ1/__p__ +1/2^} which differs moderately from the best constant in the real case __C__~__p,q__~ (โ) = max {2^1โ1/__p__^ , 2^1/__q__^ ,__B__~__p,q__~ }, where
We first show how ( p , p ' ) Clarkson inequality for a Banach space X is inherited by Lebesgue -Bochner spaces L, (X), which extends C LARKSON'S procedure deriving his inequalities for L, from their scalar versions. Fairly many previous and new results on Clarkson's inequalities, and also those on
In a recent paper KATO [3] uscd the LITTLEWOOD matrices to generalise CLARK-SON'S inequalities. Our first aim is to indicate how KATO'S result can be deduced from a neglected version of the HAUSDORFP-YOUXG inequnlity which was proved by WELLS m c t WILLIAXS [12]. \Ve next establish "random CLARKSON
## It is shown that a Banach space satisfies Clarkson's inequalities if and only if its "type or cotype constant" is 1, which implies in particular that the notions of Goand G, -Fourier type by I " (161 are equivalent. A sequence of related results is also given. 1991 Maihemaiics Subject Clarrifi
By using the LITTLEWOOD matrices B g n we generalize CLAEKSON'S inequelitiee, or equivalently, we determine the norms IIAzn : Z,2"(Lp) + Zr(Lp)ll completely. The result is compared with the norms IIAp : 1,2" -+ Zrl l , which are calculated implicitly in PIETSOE [el.