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Some remarks on level functions and their applications

Paweł ForalewskiKarol LeśnikLech Maligranda — 2016

Commentationes Mathematicae

A comparison of the level functions considered by Halperin and Sinnamon is discussed. Moreover, connections between Lorentz-type spaces, down spaces, Cesàro spaces, and Sawyer's duality formula are explained. Applying Sinnamon's ideas, we prove the duality theorem for Orlicz−Lorentz spaces which generalizes a recent result by Kamińska, Leśnik, and Raynaud (and Nakamura). Finally, some applications of the level functions to the geometry of Orlicz−Lorentz spaces are presented.

Characteristic of monotonicity of Orlicz function spaces equipped with the Orlicz norm

Paweł ForalewskiHenryk HudzikRadosław KaczmarekMiroslav Krbec — 2013

Commentationes Mathematicae

We first prove that the property of strict monotonicity of a Köthe space ( E , . E ) and/or of its Köthe dual ( E ' , . E ' ) can be used successfully to compare the supports of x E { θ } and y S ( E ' ) , where = x E . Next we prove that any element x S + ( E ) with μ ( T supp x ) = 0 is a point of order smoothness in E , whenever E is an order continuous Köthe space. Finally, we present formulas for the characteristic of monotonicity of Orlicz function spaces endowed with the Orlicz norm in the case when the generating Orlicz function does not satisfy suitable Δ 2 -condition...

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