1 Chapter 4.1, Higher order linear differential equations. General theory. page 173

  1.1 problem 1
  1.2 problem 2
  1.3 problem 8
  1.4 problem 9
  1.5 problem 10
  1.6 problem 11
  1.7 problem 16
  1.8 problem 17
  1.9 problem 20
  1.10 problem 21