13 Section 2.8.1, Singular points, Euler equations. Page 201

 13.1 problem Example 2
 13.2 problem 1
 13.3 problem 2
 13.4 problem 3
 13.5 problem 4
 13.6 problem 5
 13.7 problem 6
 13.8 problem 7
 13.9 problem 9
 13.10 problem 10