"I would suggest opening an issue about this."
I have github user name and pass word. but I can no longer login. After I
enter these, it asks me to do some 2FA
thing.,
I do not know how to use smart phone or apps.
I only can use the mouse and keyboard. It wants to scan something on the
screen or come up with some code. I have no clue how to do this.
So I will enter sympy bugs here and any one is welcome to enter them in
github. Last time I logged to github was a year ago
and can't do it anymore.
--Nasser
On Tuesday, March 4, 2025 at 12:36:35 PM UTC-6 asme...@gmail.com wrote:
> It is true that we need to disable returning series solutions by
> default. However, this solution is not a power series solution (if it
> were, it would contain an order term).
>
> The issue here is that the initial conditions solver in dsolve isn't
> handling the initial conditions correctly. I would suggest opening an
> issue about this.
>
> As an aside, I've noticed some other bugs related to this ODE: the
> 2nd_linear_bessel hint gives the wrong answer, and the checkodesol
> function should also include an ics flag so it can check initial
> conditions.
>
> Aaron Meurer
>
> On Tue, Mar 4, 2025 at 4:28 AM 'nma%12...@gtempaccount.com' via sympy
> <sy...@googlegroups.com> wrote:
> >
> > I noticed sometimes dsolve ignore IC give and gives general solution
> instead. This seems to happen when it is not able to resolve the constants
> of integrations.
> >
> > In this case it should return no solution instead.
> >
> > Is there a way to tell it not to do this? Here is an example
> >
> > >python
> > Python 3.13.1 (main, Dec 4 2024, 18:05:56) [GCC 14.2.1 20240910] on linux
> > Type "help", "copyright", "credits" or "license" for more information.
> >
> > from sympy import *
> > x = symbols("x")
> > y = Function("y")
> > ode = Eq(x**2*Derivative(y(x), (x, 2)) - 4*x*Derivative(y(x), x) +
> 6*y(x),0)
> > ics = {y(0): 2, Subs(Derivative(y(x), x), x, 2): -1}
> > dsolve(ode,func=y(x),ics=ics)
> >
> > It gives
> >
> > Eq(y(x), x**2*(C2*x - 3*C2 - 1/4))
> >
> > Notice the solution contains C2.
> >
> > Actually there is no solution to this ode with these IC's, so it should
> not have returned any solution. This is what Maple does
> >
> > ode:=x^2*diff(y(x),x$2)-4*x*diff(y(x),x)+6*y(x)=0;
> > IC:=y(0)=2,D(y)(2)=-1;
> > sol:= dsolve([ode,IC]);
> >
> > ( )
> >
> > i.e. No solution.
> >
> > --Nasser
> >
> > --
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> .
>
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