checking the sign of all terms in a long expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg132555] checking the sign of all terms in a long expression*From*: dantimatter <google at dantimatter.com>*Date*: Fri, 11 Apr 2014 02:10:09 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net

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

**Follow-Ups**:**Re: checking the sign of all terms in a long expression***From:*Bob Hanlon <hanlonr357@gmail.com>

**Re: checking the sign of all terms in a long expression***From:*Murray Eisenberg <murray@math.umass.edu>

**Re: checking the sign of all terms in a long expression***From:*Bob Hanlon <hanlonr357@gmail.com>

**R: checking the sign of all terms in a long expression***From:*"Brambilla Roberto Luigi (RSE)" <Roberto.Brambilla@rse-web.it>