23.5 Chapter 7. Special functions. Exercises at page 124

23.5.1 problem 2
23.5.2 problem 3(a)
23.5.3 problem 3(b)
23.5.4 problem 3(c)
23.5.5 problem 3(d)
23.5.6 problem 3(e)
23.5.7 problem 3(f)
23.5.8 problem 3(g)
23.5.9 problem 3(h)
23.5.10 problem 3(i)
23.5.11 problem 3(j)
23.5.12 problem 3(k)