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- W1520230059 abstract "We consider two natural definitions for the notion of a dynamical system being mixing relative to an invariant sub $sigma$-algebra $mathcal{H}$. Both concern the convergence of [|E(fcdot gcirc T^n|mathcal H)-E(f|mathcal H)E(gcirc T^n|mathcal H)|to 0] as $|n|to infty$ for appropriate $f$ and $g$. The weaker condition asks for convergence in $L^1$ and the stronger for convergence a.e. We will see that these are different conditions. Our goal is to show that both these notions are robust. As is quite standard we show that one need only consider $g=f$ and $E(f|mathcal H)=0$, and in this case $|E(fcdot fcirc T^n|mathcal H)|to 0$. We will see rather easily that for $L^1$ convergence it is enough to check an $L^2$-dense family. Our major result will be to show the same is true for pointwise convergence, making this a verifiable condition. As an application we will see that if $T$ is mixing then for any ergodic $S$, $Stimes T$ is relatively mixing with respect to the first coordinate sub $sigma$-algebra in the pointwise sense." @default.
- W1520230059 created "2016-06-24" @default.
- W1520230059 creator A5072966287 @default.
- W1520230059 date "2004-04-01" @default.
- W1520230059 modified "2023-09-28" @default.
- W1520230059 title "Pointwise and $Lsp 1$ mixing relative to a sub-sigma algebra" @default.
- W1520230059 cites W1981592766 @default.
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- W1520230059 doi "https://doi.org/10.1215/ijm/1258138395" @default.
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