[分析] distribution function

[jost (袖斯特)]

請教一題：Zygmund/integral and measure p86 #17

If f≧0 and w(α)≦c(1+α)^{-p} for all α>0, show
that f in L^{r}, 0<r<p. w(α):=|{x:f(x)>α}|
||代表測度。

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