Re: What's DSolve's output when it cant find a solution ?

• To: mathgroup at smc.vnet.net
• Subject: [mg87196] Re: What's DSolve's output when it cant find a solution ?
• From: dh <dh at metrohm.ch>
• Date: Fri, 4 Apr 2008 02:55:13 -0500 (EST)
• References: <ft2anu\$paq\$1@smc.vnet.net>

```
Hi Dennis,

it happens to everybody, you are fooling yourself: The command is

DSolve, not Dsolve.

hope this helps, Daniel

zerodynamics at gmail.com wrote:

> Im using Mathematica 6 to look for solutions to a system of nonlinear ODE's. I

> don't

> expect a solution, but the only output Im getting is an exact reprint

> of my input.

> This usually means that the arguments to the function are incorrect,

> but Im

> fairly certain they're OK.

>

> Here is my input:

>

> In[11]:=   Dsolve[{s''[t] + Cot[u[t]/2]*s'[t]*u'[t] ==  0,   u''[t] -

> Sin[u[t]]*s'[t]^2 == 0 }, {s[t], u[t]}, t]

> Out[11]:= Dsolve[{s''[t] + Cot[u[t]/2]*s'[t]*u'[t] ==  0,   u''[t] -

> Sin[u[t]]*s'[t]^2 == 0 }, {s[t], u[t]}, t]

>

> Is this what I should expect when DSolve can't find a solution ? Also,

> this is returned immediately

> without any "Running ... ".

>

> Thanks,

> Dennis

>

```

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