17.6.2 problem 1.2-1 (b)

Internal problem ID [3439]
Book : Ordinary Differential Equations, Robert H. Martin, 1983
Section : Problem 1.2-1, page 12
Problem number : 1.2-1 (b)
Date solved : Tuesday, March 04, 2025 at 04:39:11 PM
CAS classification : [_quadrature]

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

✓ Maple. Time used: 0.002 (sec). Leaf size: 10

ode:=diff(y(t),t) = -y(t); 
dsolve(ode,y(t), singsol=all);
 

\[ y = {\mathrm e}^{-t} c_{1} \]

✓ Mathematica. Time used: 0.021 (sec). Leaf size: 18

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

\begin{align*} y(t)\to c_1 e^{-t} \\ y(t)\to 0 \\ \end{align*}

✓ Sympy. Time used: 0.093 (sec). Leaf size: 7

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

\[ y{\left (t \right )} = C_{1} e^{- t} \]