15.8.38 problem 40

Internal problem ID [3041]
Book : Differential Equations by Alfred L. Nelson, Karl W. Folley, Max Coral. 3rd ed. DC heath. Boston. 1964
Section : Exercise 12, page 46
Problem number : 40
Date solved : Tuesday, March 04, 2025 at 03:47:38 PM
CAS classification : [[_homogeneous, `class A`], _rational, _Bernoulli]

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

With initial conditions

\begin{align*} y \left (1\right )&=1 \end{align*}

✓ Maple. Time used: 0.021 (sec). Leaf size: 12

ode:=x*y(x)-y(x)^2-x^2*diff(y(x),x) = 0; 
ic:=y(1) = 1; 
dsolve([ode,ic],y(x), singsol=all);
 

\[ y = \frac {x}{\ln \left (x \right )+1} \]

✓ Mathematica. Time used: 0.156 (sec). Leaf size: 13

ode=(x*y[x]-y[x]^2)-x^2*D[y[x],x]==0; 
ic={y[1]==1}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to \frac {x}{\log (x)+1} \]

✓ Sympy. Time used: 0.200 (sec). Leaf size: 8

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

\[ y{\left (x \right )} = \frac {x}{\log {\left (x \right )} + 1} \]