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Undid revision 1262378993 by Clooz1 (talk) not a typo: "iff" is a standard abbreviation for "if and only if" which should however be spelled out |
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: <math>K\subseteq\bigcup_{i=1}^{2^n} s_i K + v_i.</math>
Furthermore, the upper bound is necessary if and only if ''K'' is a parallelepiped, in which case all 2<sup>''n''</sup> of the scalars may be chosen to be equal to 1/2.
===Alternate formulation with illumination===
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