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Ă Bp1q Ă R 2 be an H 1 measurable set with H 1 pEq ă 8, and let L Ă R 2 be a line segment with H 1 pLq " H 1 pEq.It is not hard to see that FavpEq ď FavpLq.We prove that in the case of near equality, that is,the set E can be covered by an -Lipschitz graph, up to a set of length .The dependence between and δ is polynomial: in fact, the conclusions hold with " Cδ 1{70 for an absolute constant C ą 0.
Chang et al. (Fri,) studied this question.
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