= Uniform RSW crossing estimate
{title2=$\inf_n h_p(n,n)\geq\delta\ \Longrightarrow\ \inf_n h_p(\lceil\rho n\rceil,n)\geq c(\delta,\rho)$}
For independent <bond percolation> on the <square lattice>, a positive uniform lower bound for square crossings implies a positive uniform lower bound for rectangle crossings of every fixed aspect ratio $\rho>1$. The <RSW reflection extension lemma> first extends a square to aspect ratio $3/2$. Overlapping rectangles and transverse overlap-square crossings then glue using the <Harris-FKG inequality>. The required constant depends on $\delta$ and $\rho$, not on scale. At a self-dual parameter, dual crossings also give a uniform upper bound below one.
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