
Re: Is there way to use something like Assuming with the
Posted:
Nov 24, 2012 2:40 AM


"Assuming[assum, expr] evaluates expr with assum appended to $Assumptions, so that assum is included in the default assumptions used by functions such as Refine, Simplify, and Integrate."
list = {1, 2, a, 3};
Assuming[a < 0, Simplify[Sign[list]]]
{1, 1, 1, 1}
However, more compactly
Simplify[Sign[list], a < 0]
{1, 1, 1, 1}
Bob Hanlon
On Fri, Nov 23, 2012 at 3:25 AM, Eduardo Mendes <emammendes@hotmail.com> wrote: > Hello > > I was wondering there is something similar to what can be done with Integrate, Reduce and Limit. Something like > > list={1,2,a,3} > > Assuming[a<0,Sign[list]] > > Mathematica returns {1,1,Sign[a],1} and I would like to see something like {1,1,1,1}. Can that be done? > > Many thanks > > Ed > >

