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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
> 
> 


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