MathGroup Archive 2009

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: newbie: diff equation

  • To: mathgroup at
  • Subject: [mg96986] Re: newbie: diff equation
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at>
  • Date: Sun, 1 Mar 2009 04:55:26 -0500 (EST)
  • References: <> <go8hpb$ks4$>

Not only for differential equations, but for all equations.

== is the equals Function, = is the Set function.

Cheers -- Sjoerd

On Feb 27, 1:11 pm, "Ned Lieb" < at> wrote:
> You have to use two equals signs instead of one when inputting a
> differential equation.
> -----Original Message-----
> From: Mike [mailto:atkins1... at]
> Sent: Thursday, February 26, 2009 8:01 AM
> Subject:  newbie: diff equation
> My problem is very simple, I'm sure someone can help me out quickly. I am
> trying to solve some systems of differential equations a bit like a parti=
> in a box (QM) so I started with this basic problem which I know how to so=
> just to make sure I am entering everything ok, but I can't even get it to
> work.
> I want to solve f''[x]= - m^2 f[x]
> with f[0] = 0 and f[Pi] = 0
> this is obviously only solvable with the condition on m being integer but=
> I do DSolve on the above with the boundary conditions I just get f=0. H=
> can I get mathematica to solve this and give me the conditions on m? I ne=
> to solve much more general problems of this type. I hope someone can help=

  • Prev by Date: Re: FindRoot and evaluations
  • Next by Date: Re: wrong solution for double integral of piecewise function?
  • Previous by thread: Re: Can't quite figure out tensors
  • Next by thread: Re: "Do What I Mean" - a suggestion for improving Mathematica experience