Re: How to define a constant in mathematica like Pi
- To: mathgroup at smc.vnet.net
- Subject: [mg63979] Re: How to define a constant in mathematica like Pi
- From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
- Date: Thu, 26 Jan 2006 03:43:01 -0500 (EST)
- Organization: Uni Leipzig
- References: <dr7vuo$pdp$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
N[\[DoubleStruckC], prec_:16] := N[300000, prec]
$Assumptions = {\[DoubleStruckC] > 0};
and
Integrate[Exp[-\[DoubleStruckC]*x^2],
{x, -Infinity, Infinity}]
does what you want.
Regards
Jens
"José Carlos Santos" <jcsantos at fc.up.pt> schrieb
im Newsbeitrag news:dr7vuo$pdp$1 at smc.vnet.net...
| Hi all,
|
| I'm posting a question asked by someone who is
currently unable to post
| here. Here's the problem:
|
| I would like to define a constant in
mathematica for example c=1.2345
| in such a way that it behaves exactly like Pi
or E. That is when I
| type c then I get the output c and not
1.2345.
|
| If I do integration[Exp[-c*x^2],{x,-oo,oo}]
then I should get
| sqrt[Pi/c] and not If[c<0...]
|
| Best regards,
|
| Jose Carlos Santos
|