Re: Solve vs Reduce
- To: mathgroup at smc.vnet.net
- Subject: [mg94649] Re: Solve vs Reduce
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 19 Dec 2008 07:22:06 -0500 (EST)
- Organization: Uni Leipzig
- References: <gidf6i$9v$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi,
try
Reduce[equations, {Dt[x, t], Dt[y, t]}]
Regards
Jens
Jaccard Florian wrote:
> Hello!
>
> I have the following system :
>
> In[1]:= equations = {5/(x + y) == 2/y, Dt[5/(x + y) == 2/y, =
> t], Dt[x, t]
> == 1, x == 5}
>
> As you can see, Solve manages very well to find Dt[y,t] :
>
> In[2]:= Solve[equations, Dt[y, t]]
>
> Out[2]= {{Dt[y, t] -> 2/3}}
>
> Why isn't Reduce able to find the solution?
>
> In[3]:= Reduce[equations, Dt[y, t]]
>
> Out[3]= False
>
> Regards, and thanks to all who will answer!
>
> Florian Jaccard
>
>