Groups > comp.soft-sys.math.mathematica > #16771

checking the sign of all terms in a long expression

From	dantimatter <google@dantimatter.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	checking the sign of all terms in a long expression
Date	2014-04-11 06:10 +0000
Message-ID	<li8109$ad0$1@smc.vnet.net> (permalink)
Organization	Time-Warner Telecom

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hello all
is there to check the signs of all terms in a symbolic expression, like

toCheck = a + a b + a b c + a c - b + bc + d ....

in this case, with the assumption that the a, b, c etc are all positive, only one term is negative (b by itself) and the rest are positive.  I have expressions like this that have a hundred or more terms and i'm worried i might not be catching all those that are of a different sign. 

thanks

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checking the sign of all terms in a long expression dantimatter <google@dantimatter.com> - 2014-04-11 06:10 +0000

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