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Questions about Hausdorff measures, their variants (such as spherical Hausdorff measures) and generalisations.

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Sets that project to zero measure on all lines except one

Consider a sequence of rational numbers $s_i$ with the following property: For each rational number $s$ and nonnegative integer $n$, there exists $i$ such that $ s=s_i =s_{i+1} = \dots = s_{i+n}$, and …
Will Sawin's user avatar
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