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When a set of measure zero plus intself contains interior

Is there a characterization of sets $A$ in $\mathbb R^n$ of measure zero such that the set $A+A$ contains interior? Here $A+A=\{ x+y \mid x, y\in A \}$.

Is it true that if the convex hull of the connected component of $A$ contains interior then so does $A+A$?

spr
  • 415
  • 2
  • 8