64.23.1 problem 1

Internal problem ID [13599]
Book : Differential Equations by Shepley L. Ross. Third edition. John Willey. New Delhi. 2004.
Section : Chapter 12, Sturm-Liouville problems. Section 12.1, Exercises page 596
Problem number : 1
Date solved : Wednesday, March 05, 2025 at 10:04:39 PM
CAS classification : [[_2nd_order, _missing_x]]

\begin{align*} y^{\prime \prime }+\lambda y&=0 \end{align*}

With initial conditions

\begin{align*} y \left (0\right )&=0\\ y \left (\frac {\pi }{2}\right )&=0 \end{align*}

✓ Maple. Time used: 0.015 (sec). Leaf size: 5

ode:=diff(diff(y(x),x),x)+lambda*y(x) = 0; 
ic:=y(0) = 0, y(1/2*Pi) = 0; 
dsolve([ode,ic],y(x), singsol=all);
 

\[ y = 0 \]

✓ Mathematica. Time used: 0.001 (sec). Leaf size: 34

ode=D[y[x],{x,2}]+\[Lambda]*y[x]==0; 
ic={y[0]==0,y[Pi/2]==0}; 
DSolve[{ode,ic},{y[x]},x,IncludeSingularSolutions->True]
 

\[ y(x)\to \begin {array}{cc} \{ & \begin {array}{cc} c_1 \sin \left (x \sqrt {\lambda }\right ) & \unicode {f80d}\in \mathbb {Z}\land \unicode {f80d}\geq 1\land \lambda =4 \unicode {f80d}^2 \\ 0 & \text {True} \\ \end {array} \\ \end {array} \]

✓ Sympy. Time used: 0.102 (sec). Leaf size: 3

from sympy import * 
x = symbols("x") 
cg = symbols("cg") 
y = Function("y") 
ode = Eq(cg*y(x) + Derivative(y(x), (x, 2)),0) 
ics = {y(0): 0, y(pi/2): 0} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = 0 \]