
From:  Joey Rios 
Subject:  [Helpglpk] What is a vanishing variable? 
Date:  Wed, 30 Sep 2009 12:35:54 0700 
This isn't a GLPKspecific question, but this seems like a good place to ask this question. I am reading a journal article from the 60's. The author mentions "nonvanishing variables." With the context, it seems like this might be a term for "nonzero valued variables" but I am just guessing. Is there a formal definition of a 'vanishing variable' that anyone has heard of? Maybe it's a linear algebra term? Couldn't find a good definition/use via google. Here is the sentence where the term is first used: "Let T be a given basic feasible solution of (3) and denote by Nthe number of not vanishing t_i in T; V_ythe number of vanishing y_i in T..." In the LP described by (3), t's and y's are the decision variables, all >= 0. Thanks in advance... Joey Bingâ„˘ brings you maps, menus, and reviews organized in one place. Try it now. 
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