50.2.9 problem 1(i)

Internal problem ID [7815]
Book : Differential Equations: Theory, Technique, and Practice by George Simmons, Steven Krantz. McGraw-Hill NY. 2007. 1st Edition.
Section : Chapter 1. What is a differential equation. Section 1.3 SEPARABLE EQUATIONS. Page 12
Problem number : 1(i)
Date solved : Wednesday, March 05, 2025 at 05:06:52 AM
CAS classification : [_separable]

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

✓ Maple. Time used: 0.013 (sec). Leaf size: 12

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

\[ y = \operatorname {LambertW}\left (x c_{1} {\mathrm e}^{-1}\right )+1 \]

✓ Mathematica. Time used: 3.048 (sec). Leaf size: 21

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

\begin{align*} y(x)\to 1+W\left (e^{-1+c_1} x\right ) \\ y(x)\to 1 \\ \end{align*}

✓ Sympy. Time used: 0.250 (sec). Leaf size: 8

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

\[ y{\left (x \right )} = W\left (C_{1} x\right ) + 1 \]