23.5.164 problem 164

Internal problem ID [6773]
Book : Ordinary differential equations and their solutions. By George Moseley Murphy. 1960
Section : Part II. Chapter 5. THE EQUATION IS LINEAR AND OF ORDER GREATER THAN TWO, page 410
Problem number : 164
Date solved : Tuesday, September 30, 2025 at 03:51:34 PM
CAS classification : [[_high_order, _missing_y]]

\begin{align*} 5 y^{\prime \prime \prime }+x y^{\prime \prime \prime \prime }&=0 \end{align*}

✓ Maple. Time used: 0.003 (sec). Leaf size: 19

ode:=5*diff(diff(diff(y(x),x),x),x)+x*diff(diff(diff(diff(y(x),x),x),x),x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = c_1 +c_2 x +\frac {c_3}{x^{2}}+c_4 \,x^{2} \]

✓ Mathematica. Time used: 0.016 (sec). Leaf size: 27

ode=5*D[y[x],{x,3}] + x*D[y[x],{x,4}] == 0; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)&\to c_4 x^2-\frac {c_1}{24 x^2}+c_3 x+c_2 \end{align*}

✓ Sympy. Time used: 0.053 (sec). Leaf size: 17

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(x*Derivative(y(x), (x, 4)) + 5*Derivative(y(x), (x, 3)),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

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