6 Chapter 27. Power series solutions of linear DE with variable coefficients. Supplementary Problems. page 274

  6.1 problem Problem 27.28
  6.2 problem Problem 27.30
  6.3 problem Problem 27.36
  6.4 problem Problem 27.37
  6.5 problem Problem 27.38
  6.6 problem Problem 27.39
  6.7 problem Problem 27.40
  6.8 problem Problem 27.41
  6.9 problem Problem 27.42
  6.10 problem Problem 27.48