Saturday, 27 February 2010

gn.general topology - Hausdorff dimension: subset of mathbbRn vs. boundary of this subset

"Smaller" in the sense of le ... If S is closed and has Hausdorff dimension <n, then S has empty interior, so (as noted by Joel) S is its own boundary, and thus we have equality for the two dimensions. And of course if (perhaps not closed) set S has dimension n, then the boundary could have any dimension from 0 to n, inclusive. If S is closed and has dimension n, then the boundary is either empty or has dimension gen1.

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