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From: Geico Caveman on 7 Apr 2010 03:19
A question arising out of laziness.

I have about 20 expressions that I want to simplify using the same set
of assumptions. Is there an easy method for this ?

From: Simon on 7 Apr 2010 07:27
On Apr 7, 3:19 pm, Geico Caveman <spammers-go-h...(a)spam.invalid>
wrote:
> A question arising out of laziness.
>
> I have about 20 expressions that I want to simplify using the same set
> of assumptions. Is there an easy method for this ?

Easiest way is if your objects _always_ satisfy some conditions is to
set the global assumptions:

$Assumptions = ...

otherwise you could define your own assumptions that you pass to
Simplify:

myAssumptions = a>0 && b>1;
Simplify[ a + b > 1, myAssumptions]

From: Bob Hanlon on 8 Apr 2010 08:01

Use $Assumptions


Bob Hanlon

---- Geico Caveman <spammers-go-here(a)spam.invalid> wrote:

=============
A question arising out of laziness.

I have about 20 expressions that I want to simplify using the same set
of assumptions. Is there an easy method for this ?


From: telefunkenvf14 on 8 Apr 2010 08:01
On Apr 7, 6:27 am, Simon <simonjty...(a)gmail.com> wrote:
> On Apr 7, 3:19 pm, Geico Caveman <spammers-go-h...(a)spam.invalid>
> wrote:
>
> > A question arising out of laziness.
>
> > I have about 20 expressions that I want to simplify using the same set
> > of assumptions. Is there an easy method for this ?
>
> Easiest way is if your objects _always_ satisfy some conditions is to
> set the global assumptions:
>
> $Assumptions = ...
>
> otherwise you could define your own assumptions that you pass to
> Simplify:
>
> myAssumptions = a>0 && b>1;
> Simplify[ a + b > 1, myAssumptions]

I like the global assumption route. If it matters, make sure you
evaluate $Assumptions=True after performing your intended tasks, to
reset.

Here's a question I've had for a while... Why does $Assumptions=True
make sense as the default setting? (I'm trying to understand this from
the Mathematica point of view---would have guessed $Assumptions=Null)

-RG

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