9.7.15 problem problem 15

Internal problem ID [1056]
Book : Differential equations and linear algebra, 4th ed., Edwards and Penney
Section : Chapter 11 Power series methods. Section 11.1 Introduction and Review of power series. Page 615
Problem number : problem 15
Date solved : Monday, January 27, 2025 at 04:32:38 AM
CAS classification : [_separable]

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

Using series method with expansion around

\begin{align*} 0 \end{align*}

✓ Solution by Maple

Time used: 0.006 (sec). Leaf size: 14

Order:=6; 
dsolve(x*diff(y(x),x)+y(x)=0,y(x),type='series',x=0);
 

\[ y = \frac {c_1}{x}+O\left (x^{6}\right ) \]

✓ Solution by Mathematica

Time used: 0.001 (sec). Leaf size: 9

AsymptoticDSolveValue[x*D[y[x],x]+y[x]==0,y[x],{x,0,"6"-1}]
 

\[ y(x)\to \frac {c_1}{x} \]