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On the Martingale Transforms in expLp and Its Application

机译:expLp中的ting变换及其应用

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摘要

Let 1<α<β<+∞ and 1<β<γ<+∞. Let {νn}be an adapted process of { n}, and {fn} be a martingale about { n}. {νn}is multiplier of martingale transform to be of type (exp Lα,exp Lβ). Let Φ(t)be continuous nonnegative strictly increasing convex function defined on[o,+∞], satisfying the Δ2 -condition such that there is a constant c1>1 such that Φ-1(t)[1n(1+t)]-1/a is non-increasing in[c1,+∞], andΦ(t) be continuous nonnegative strictly increasing function defined on[0,+∞], satisfying Φ-1(t)[1n(1+u)]δ≤Kψ-1(t) for all t>c2, where K>0 and c2>1 are constants and δ=max{1/β-1/α,1/γ}, then transform of multiplier {νn}is to be type (LΦ,LΦ)‖Tvf‖LΦ≤C‖f‖LΦ,where C is a constant.
机译:令1 <α<β<+∞和1 <β<γ<+∞。假设{νn}是{n}的适应过程,而{fn}是关于{n}的mar。 {νn}是of变换的乘数,其类型为(expLα,expLβ)。令Φ(t)为在[o,+∞]上定义的连续非负严格增加的凸函数,满足Δ2-条件,使得c1> 1为常数,使得Φ-1(t)[1n(1 + t) ] -1 / a在[c1,+∞]中不增加,并且Φ(t)是在[0,+∞]上定义的连续非负严格增加函数,满足Φ-1(t)[1n(1 + u)对于所有t> c2,δδKψ-1(t),其中K> 0和c2> 1是常数,δ= max {1 /β-1/α,1 /γ},然后对乘数{νn}进行变换的类型为(LΦ,LΦ)‖Tvf‖LΦ≤C‖f‖LΦ,其中C为常数。

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