Re: Big problem in solving radicals.
- To: mathgroup at smc.vnet.net
- Subject: [mg41786] Re: Big problem in solving radicals.
- From: davide at astromeccanica.it (Davide Del Vento)
- Date: Thu, 5 Jun 2003 07:31:29 -0400 (EDT)
- References: <bbi16p$7c1$1@smc.vnet.net> <bbkq1p$hi5$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi.
> {{x -> a^2}}
>
> *is* the general solution, nobody say that x (or a)
> must be real.
If a>0 this is not a solution of my equation, that is:
+ sqrt(x) + a == 0
And *NOT*
- sqrt(x) + a == 0
> There is no way to ask Mathematica for only a real
> solution in symbolic expressions.
I don't want this, I would like to have something like this:
x=a^2 if a<0
NONE if a>0
In the case of this example things are pretty simple, but if you want
I can give you a case in which this limitation is *very* big.
Bye,
;Davide Del Vento
CNR Istituto Fisica Spazio Interplanetario
via del Fosso del Cavaliere, 100 / IT-00133 / Rome
Phone: +390649934357
Fax: +390649934383
Mobile: +393288329015
E-Mail: davide @ astromeccanica.it
E-Mail: del vento @ ifsi . rm . cnr . it