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Groups > comp.soft-sys.math.mathematica > #16939 > unrolled thread
| Started by | Sasa B <neprihvatljivo@gmail.com> |
|---|---|
| First post | 2014-05-12 04:46 +0000 |
| Last post | 2014-05-13 02:27 +0000 |
| Articles | 2 — 2 participants |
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Re: DSolve test Sasa B <neprihvatljivo@gmail.com> - 2014-05-12 04:46 +0000
Re: DSolve test carlos.felippa%colorado.edu@gtempaccount.com - 2014-05-13 02:27 +0000
| From | Sasa B <neprihvatljivo@gmail.com> |
|---|---|
| Date | 2014-05-12 04:46 +0000 |
| Subject | Re: DSolve test |
| Message-ID | <lkpjmc$lmi$1@smc.vnet.net> |
First, all the best to one of the most influential mechanics teacher of our
time, I'm glad to give this minor help :)
Bug doesn't seem fixed
sol = DSolve[{u'[t] == 2*Sqrt[u[t]], u[0] == 0}, u[t], t]; Print[sol];
returns
{{u[t]->t^2}}
(Mathematica 9, Intel 4570)
Aleksandar Borkovic
On Fri, May 9, 2014 at 8:07 AM, <
carlos.felippa%colorado.edu@gtempaccount.com> wrote:
> Hi, could somebody try this in Mathematica 9 to see if the bug is fixed?
>
> sol = DSolve[{u'[t] == 2*Sqrt[u[t]], u[0] == 0}, u[t], t]; Print[sol];
>
> Thanks.
>
>
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| From | carlos.felippa%colorado.edu@gtempaccount.com |
|---|---|
| Date | 2014-05-13 02:27 +0000 |
| Message-ID | <lkrvu1$2o$1@smc.vnet.net> |
| In reply to | #16939 |
On Sunday, May 11, 2014 10:46:04 PM UTC-6, Sasa B wrote:
> First, all the best to one of the most influential mechanics teacher of our
>
> time, I'm glad to give this minor help :)
>
>
>
>
>
> Bug doesn't seem fixed
>
>
>
> sol = DSolve[{u'[t] == 2*Sqrt[u[t]], u[0] == 0}, u[t], t]; Print[sol];
>
>
>
> returns
>
>
>
> {{u[t]->t^2}}
>
>
>
> (Mathematica 9, Intel 4570)
>
>
>
>
>
> Aleksandar Borkovic
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Fri, May 9, 2014 at 8:07 AM, <
>
> carlos.felippa%colorado.edu@gtempaccount.com> wrote:
>
>
>
> > Hi, could somebody try this in Mathematica 9 to see if the bug is fixed?
>
> >
>
> > sol = DSolve[{u'[t] == 2*Sqrt[u[t]], u[0] == 0}, u[t], t]; Print[sol];
>
> >
>
> > Thanks.
>
> >
>
> >
Thanks to all who replied. The bug is still there :-(
u=t=0 is a fixed branch point. Two solutions: u=0 and u=t^2.
DSolve only returns the latter.
I can give other examples if interested.
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