I see, thanks for the tip -- didn't know about that option ! On Tuesday, March 26, 2013 7:36:45 AM UTC-6, Volker Braun wrote: > > You'll have to use the hold=True argument to not evaluate such expressions > automatically: > > sage: x.add(-oo, hold=True) <= 0 > x - Infinity <= 0 > > > > On Tuesday, March 26, 2013 5:59:47 AM UTC+1, tvn wrote: >> >> In my project I often have inequalities x <= c , x+y <= c, x -y <= c and >> to make things uniform, I move all the consts to the lhs, e.g. x <= c >> becomes x - c <= 0 . However this becomes problem when c is Infinity >> because Sage automatically converts x - oo <= 0 to -Infinity <= 0 and >> removes all variables in the original relation. Is there a way to get >> around this ? I thought about creating a new variable to represent oo but >> thought there could be easier way. >> >
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