67.23.16 problem 33.5 (d)

Internal problem ID [16949]
Book : Ordinary Differential Equations. An introduction to the fundamentals. Kenneth B. Howell. second edition. CRC Press. FL, USA. 2020
Section : Chapter 33. Power series solutions I: Basic computational methods. Additional Exercises. page 641
Problem number : 33.5 (d)
Date solved : Thursday, October 02, 2025 at 01:40:36 PM
CAS classification : [[_Emden, _Fowler]]

\begin{align*} y^{\prime \prime }-3 x^{2} y&=0 \end{align*}

Using series method with expansion around

\begin{align*} 0 \end{align*}

✓ Maple. Time used: 0.004 (sec). Leaf size: 29

Order:=6; 
ode:=diff(diff(y(x),x),x)-3*x^2*y(x) = 0; 
dsolve(ode,y(x),type='series',x=0);
 

\[ y = \left (1+\frac {x^{4}}{4}\right ) y \left (0\right )+\left (x +\frac {3}{20} x^{5}\right ) y^{\prime }\left (0\right )+O\left (x^{6}\right ) \]

✓ Mathematica. Time used: 0.001 (sec). Leaf size: 28

ode=D[y[x],{x,2}]-3*x^2*y[x]==0; 
ic={}; 
AsymptoticDSolveValue[{ode,ic},y[x],{x,0,5}]
 

\[ y(x)\to c_2 \left (\frac {3 x^5}{20}+x\right )+c_1 \left (\frac {x^4}{4}+1\right ) \]

✓ Sympy. Time used: 0.183 (sec). Leaf size: 26

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(-3*x**2*y(x) + Derivative(y(x), (x, 2)),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics,hint="2nd_power_series_ordinary",x0=0,n=6)
 

\[ y{\left (x \right )} = C_{2} \left (\frac {x^{4}}{4} + 1\right ) + C_{1} x \left (\frac {3 x^{4}}{20} + 1\right ) + O\left (x^{6}\right ) \]