69.23 Chapter 2 (Higher order ODEs). Section 18.1 Integration of differential equation in series. Power series. Exercises page 171

69.23.1 problem 724
69.23.2 problem 725
69.23.3 problem 726
69.23.4 problem 727
69.23.5 problem 728
69.23.6 problem 729
69.23.7 problem 730
69.23.8 problem 731
69.23.9 problem 732
69.23.10 problem 733
69.23.11 problem 734
69.23.12 problem 735
69.23.13 problem 736
69.23.14 problem 737
69.23.15 problem 738