1 The reader is expected to have some background of the tests for convergence of infinite series, and we do not indulge in it right here.
2 or, initial conditions, as noted earlier
3 Noting that our example of the current section is also nothing but an Euler-Cauchy equation, we leave it at this stage. The reader may verify how Frobenius’ method will give the same solution as the method of Chap. 33.
4 Again, without loss of generality, we analyze the case of x0 = 0.
5 At least one Frobenius series solution, corresponding to the larger of r1 and r2 is guaranteed.
6 This is certainly not surprising, particularly because there are complete books on “Bessel functions”!
7 The case of k = l + , even though not an integer, gives r1 − r2