54.3.73 problem 1087

Internal problem ID [12368]
Book : Differential Gleichungen, E. Kamke, 3rd ed. Chelsea Pub. NY, 1948
Section : Chapter 2, linear second order
Problem number : 1087
Date solved : Friday, October 03, 2025 at 03:18:43 AM
CAS classification : [[_2nd_order, _with_linear_symmetries]]

\begin{align*} 4 y^{\prime \prime }-\left (x^{2}+a \right ) y&=0 \end{align*}

✓ Maple. Time used: 0.034 (sec). Leaf size: 33

ode:=4*diff(diff(y(x),x),x)-(x^2+a)*y(x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = \frac {c_1 \operatorname {WhittakerM}\left (-\frac {a}{8}, \frac {1}{4}, \frac {x^{2}}{2}\right )+c_2 \operatorname {WhittakerW}\left (-\frac {a}{8}, \frac {1}{4}, \frac {x^{2}}{2}\right )}{\sqrt {x}} \]

✓ Mathematica. Time used: 0.015 (sec). Leaf size: 36

ode=(-a - x^2)*y[x] + 4*D[y[x],{x,2}] == 0; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)&\to c_1 \operatorname {ParabolicCylinderD}\left (\frac {1}{4} (-a-2),x\right )+c_2 \operatorname {ParabolicCylinderD}\left (\frac {a-2}{4},i x\right ) \end{align*}

✗ Sympy

from sympy import * 
x = symbols("x") 
a = symbols("a") 
y = Function("y") 
ode = Eq((-a - x**2)*y(x) + 4*Derivative(y(x), (x, 2)),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

False