About the # Function
Canadian mathematical bulletin, Tome 19 (1976) no. 4, pp. 455-460

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The use of decreasing rearrangement formulas, and particularly that of the weak N inequality, is illustrated by deriving from E τ |f-f(τ -)|≤E τ u (where f t is some stochastic process and τ arbitrary stopping time) the estimate ||f||≤Const||u|| in the class of structureless norms with finite dual Hardy bound.The basic estimate is
Klincsek, G. T. About the # Function. Canadian mathematical bulletin, Tome 19 (1976) no. 4, pp. 455-460. doi: 10.4153/CMB-1976-068-0
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     title = {About the # {Function}},
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