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Upper estimates for superposition operators and some applications. (English) Zbl 0489.47017

##### MSC:
 47B38 Linear operators on function spaces (general) 46G05 Derivatives of functions in infinite-dimensional spaces 46E30 Spaces of measurable functions ($$L^p$$-spaces, Orlicz spaces, Köthe function spaces, Lorentz spaces, rearrangement invariant spaces, ideal spaces, etc.)
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