I am using Mathematica 11.1, and I stumbled upon this strange response using the
FullSimplify[Abs[x],x<0] (* Abs[x] *)
while, for example
FullSimplify[Abs[x],x>0] (* x *)
My question: Why doesn't Mathematica simplify
-xwhen it is given the extra information
x<0? Could it be on purpose?
I looked for duplicates, but I could not find a question that was spot on. I'm sorry if I missed some question.