Aalto, Daniel:
Weak $L^\infty$ and BMO in Metric Spaces
Bollettino dell'Unione Matematica Italiana Serie 9 5 (2012), fasc. n.2, p. 369-385, (English)
pdf (314 Kb), djvu (138 Kb). | MR 2977254 | Zbl 1256.46013
Sunto
Bennett, DeVore and Sharpley introduced the space weak $L^{\infty}$ in 1981 and studied its relationship with functions of bounded mean oscillation. Here we characterize the weak $L^{\infty}$ in measure spaces without using the decreasing rearrangement of a function. Instead, we use exponential estimates for the distribution function. In addition, we consider a localized version of the characterization that leads to a new characterization of BMO.
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