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It would be nice if variables are defined before (or just after) being used. For example, at the begining, <math>U</math> and <math>\sigma_i</math> are not defined and its confusing for non-expert public.
[[User:Felipebm|Felipebm]] ([[User talk:Felipebm|talk]]) 13:34, 17 May 2011 (UTC)
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