72.2.18 problem 16 (iii)

Internal problem ID [14582]
Book : DIFFERENTIAL EQUATIONS by Paul Blanchard, Robert L. Devaney, Glen R. Hall. 4th edition. Brooks/Cole. Boston, USA. 2012
Section : Chapter 1. First-Order Differential Equations. Exercises section 1.3 page 47
Problem number : 16 (iii)
Date solved : Monday, March 31, 2025 at 12:35:22 PM
CAS classification : [_quadrature]

\begin{align*} y^{\prime }&=y^{3}+y^{2} \end{align*}

✓ Maple. Time used: 0.041 (sec). Leaf size: 18

ode:=diff(y(t),t) = y(t)^3+y(t)^2; 
dsolve(ode,y(t), singsol=all);
 

\[ y = -\frac {1}{\operatorname {LambertW}\left (-c_1 \,{\mathrm e}^{-1+t}\right )+1} \]

✓ Mathematica. Time used: 0.194 (sec). Leaf size: 40

ode=D[y[t],t]==y[t]^3+y[t]^2; 
ic={}; 
DSolve[{ode,ic},y[t],t,IncludeSingularSolutions->True]
 

\begin{align*} y(t)\to \text {InverseFunction}\left [\int _1^{\text {$\#$1}}\frac {1}{K[1]^2 (K[1]+1)}dK[1]\&\right ][t+c_1] \\ y(t)\to -1 \\ y(t)\to 0 \\ \end{align*}

✓ Sympy. Time used: 0.287 (sec). Leaf size: 19

from sympy import * 
t = symbols("t") 
y = Function("y") 
ode = Eq(-y(t)**3 - y(t)**2 + Derivative(y(t), t),0) 
ics = {} 
dsolve(ode,func=y(t),ics=ics)
 

\[ t - \log {\left (y{\left (t \right )} + 1 \right )} + \log {\left (y{\left (t \right )} \right )} + \frac {1}{y{\left (t \right )}} = C_{1} \]