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| From | Bob Hanlon <hanlonr357@gmail.com> |
|---|---|
| Newsgroups | comp.soft-sys.math.mathematica |
| Subject | Re: DSolve test |
| Date | 2014-05-12 04:42 +0000 |
| Message-ID | <lkpjeo$ljk$1@smc.vnet.net> (permalink) |
| References | <20140509060727.CC1026AD8@smc.vnet.net> |
| Organization | Time-Warner Telecom |
You did not say what bug or with which version. Version 9 gives a correct
solution for t >= 0
$Version
"9.0 for Mac OS X x86 (64-bit) (January 24, 2013)"
sol = DSolve[
{u'[t] == 2*Sqrt[u[t]], u[0] == 0},
u[t], t][[1, 1]]
u[t] -> t^2
u'[t] == 2*Sqrt[u[t]] /.
NestList[D[#, t] &, sol, 1] //
Simplify[#, t >= 0] &
True
u[0] == 0 /. (sol /. t -> 0)
True
Bob Hanlon
On Fri, May 9, 2014 at 2:07 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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Re: DSolve test Bob Hanlon <hanlonr357@gmail.com> - 2014-05-12 04:42 +0000
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