
Two Littlewood-Paley operators, the area integral and the function g λ ∗ g_\lambda ^ * , are considered as operators on functions of bounded mean oscillation. It is proved that the image of a BMO function under one of these operators is either equal to infinity almost everywhere or is in BMO.
Maximal functions, Littlewood-Paley theory, Littlewood-Paley function, Poisson integral
Maximal functions, Littlewood-Paley theory, Littlewood-Paley function, Poisson integral
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