
Re: DSolve test
Posted:
May 12, 2014 12:42 AM


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 (64bit) (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. > >

