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added 68 characters in body

edited Sep 23, 2012 at 5:12

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$S$ is the complement of the [Minkowski sum][1]${}^*$ of a connected body and the sphere of radius $r$.

${}^*$ Provided the Minkowski sum doesn't self-intersect. [1]: http://en.wikipedia.org/wiki/Minkowski_sum

answered Sep 22, 2012 at 22:14

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