29.6.27 problem 173

Internal problem ID [4773]
Book : Ordinary differential equations and their solutions. By George Moseley Murphy. 1960
Section : Various 6
Problem number : 173
Date solved : Sunday, March 30, 2025 at 03:53:51 AM
CAS classification : [[_homogeneous, `class D`], _rational, _Bernoulli]

\begin{align*} x y^{\prime }&=\left (1-x y\right ) y \end{align*}

✓ Maple. Time used: 0.002 (sec). Leaf size: 16

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

\[ y = \frac {2 x}{x^{2}+2 c_1} \]

✓ Mathematica. Time used: 0.148 (sec). Leaf size: 23

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

\begin{align*} y(x)\to \frac {2 x}{x^2+2 c_1} \\ y(x)\to 0 \\ \end{align*}

✓ Sympy. Time used: 0.191 (sec). Leaf size: 10

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

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