80.12.4 problem 5

Internal problem ID [21437]
Book : A Textbook on Ordinary Differential Equations by Shair Ahmad and Antonio Ambrosetti. Second edition. ISBN 978-3-319-16407-6. Springer 2015
Section : Chapter 13. Boundary value problems. Excercise 13.5 at page 291
Problem number : 5
Date solved : Friday, October 03, 2025 at 07:51:57 AM
CAS classification : [[_2nd_order, _missing_x], [_2nd_order, _reducible, _mu_x_y1]]

\begin{align*} x^{\prime \prime }+\lambda x-x^{3}&=0 \end{align*}

With initial conditions

\begin{align*} x \left (0\right )&=0 \\ x \left (1\right )&=0 \\ \end{align*}

✓ Maple. Time used: 0.033 (sec). Leaf size: 5

ode:=diff(diff(x(t),t),t)+lambda*x(t)-x(t)^3 = 0; 
ic:=[x(0) = 0, x(1) = 0]; 
dsolve([ode,op(ic)],x(t), singsol=all);
 

\[ x = 0 \]

✗ Mathematica

ode=D[x[t],{t,2}]+\[Lambda]*x[t]-x[t]^3==0; 
ic={x[0]==0,x[1]==0}; 
DSolve[{ode,ic},x[t],t,IncludeSingularSolutions->True]
 

{}

✗ Sympy

from sympy import * 
t = symbols("t") 
lambda_ = symbols("lambda_") 
x = Function("x") 
ode = Eq(lambda_*x(t) - x(t)**3 + Derivative(x(t), (t, 2)),0) 
ics = {x(0): 0, x(1): 0} 
dsolve(ode,func=x(t),ics=ics)
 

Timed Out