67.2.3 problem Problem 1(c)

Internal problem ID [13881]
Book : APPLIED DIFFERENTIAL EQUATIONS The Primary Course by Vladimir A. Dobrushkin. CRC Press 2015
Section : Chapter 4, Second and Higher Order Linear Differential Equations. Problems page 221
Problem number : Problem 1(c)
Date solved : Friday, March 14, 2025 at 12:17:33 AM
CAS classification : [[_2nd_order, _missing_x], [_2nd_order, _exact, _nonlinear], [_2nd_order, _reducible, _mu_x_y1], [_2nd_order, _reducible, _mu_xy]]

\begin{align*} y^{\prime \prime }+y y^{\prime }&=1 \end{align*}

✓ Maple. Time used: 0.194 (sec). Leaf size: 60

ode:=diff(diff(y(x),x),x)+y(x)*diff(y(x),x) = 1; 
dsolve(ode,y(x), singsol=all);
 

\[ -2 \,2^{{2}/{3}} \left (\int _{}^{y}\frac {1}{2^{{2}/{3}} \textit {\_a}^{2}-4 \operatorname {RootOf}\left (2^{{1}/{3}} \operatorname {AiryBi}\left (\textit {\_Z} \right ) c_{1} \textit {\_a} +2^{{1}/{3}} \textit {\_a} \operatorname {AiryAi}\left (\textit {\_Z} \right )-2 \operatorname {AiryBi}\left (1, \textit {\_Z}\right ) c_{1} -2 \operatorname {AiryAi}\left (1, \textit {\_Z}\right )\right )}d \textit {\_a} \right )-x -c_{2} = 0 \]

✓ Mathematica. Time used: 54.697 (sec). Leaf size: 111

ode=D[y[x],{x,2}]+y[x]*D[y[x],x]==1; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)\to \frac {2^{2/3} \left (c_2 \operatorname {AiryAiPrime}\left (\frac {x-c_1}{\sqrt [3]{2}}\right )+\operatorname {AiryBiPrime}\left (\frac {x-c_1}{\sqrt [3]{2}}\right )\right )}{c_2 \operatorname {AiryAi}\left (\frac {x-c_1}{\sqrt [3]{2}}\right )+\operatorname {AiryBi}\left (\frac {x-c_1}{\sqrt [3]{2}}\right )} \\ y(x)\to \frac {2^{2/3} \operatorname {AiryAiPrime}\left (\frac {x-c_1}{\sqrt [3]{2}}\right )}{\operatorname {AiryAi}\left (\frac {x-c_1}{\sqrt [3]{2}}\right )} \\ \end{align*}

✗ Sympy

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

NotImplementedError : The given ODE -(1 - Derivative(y(x), (x, 2)))/y(x) + Derivative(y(x), x) cannot be solved by the factorable group method