6 Problem 1.2-1, page 12

  6.1 problem 1.2-1 (a)
  6.2 problem 1.2-1 (b)
  6.3 problem 1.2-1 (c)
  6.4 problem 1.2-1 (d)
  6.5 problem 1.2-1 (e)
  6.6 problem 1.2-1 (f)
  6.7 problem 1.2-1 (g)
  6.8 problem 1.2-1 (h)
  6.9 problem 1.2-1 (i)