81.1.13 problem 12

Internal problem ID [18608]
Book : A short course on differential equations. By Donald Francis Campbell. Maxmillan company. London. 1907
Section : Chapter I. Introduction. Exercises at page 13
Problem number : 12
Date solved : Tuesday, January 28, 2025 at 12:04:00 PM
CAS classification : [[_2nd_order, _missing_y]]

\begin{align*} v^{\prime \prime }+\frac {2 v^{\prime }}{r}&=0 \end{align*}

✓ Solution by Maple

Time used: 0.003 (sec). Leaf size: 11

dsolve(diff(v(r),r$2)+2/r*diff(v(r),r)=0,v(r), singsol=all)
 

\[ v \left (r \right ) = c_{1} +\frac {c_{2}}{r} \]

✓ Solution by Mathematica

Time used: 0.010 (sec). Leaf size: 15

DSolve[D[v[r],{r,2}]+2/r*D[v[r],r]==0,v[r],r,IncludeSingularSolutions -> True]
 

\[ v(r)\to c_2-\frac {c_1}{r} \]