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As currently written, the inequality in the article is

${\displaystyle V_{I}(f)\leq V_{I}(f)+{\frac {1}{2}}}$

which can have no useful implications. I think maybe there is a derivative missing on one of the f's? Sławomir Biały ( talk) 03:04, 16 July 2011 (UTC) reply

Yes, Michael Hardy improved the layout but destroyed the content. Will fix. Ansukam ( talk) 22:37, 17 July 2011 (UTC) reply