By John Heading
Since the variety of purposes is significant, the textual content considers just a short collection of themes and emphasizes the tactic itself instead of particular purposes. the method, as soon as derived, is proven to be certainly one of crucial simplicity that consists of basically the appliance of yes well-defined ideas. beginning with a ancient survey of the matter and its ideas, topics comprise the Stokes phenomenon, one and transition issues, and functions to actual difficulties. An appendix and bibliography finish the text.
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Additional info for An Introduction to Phase-Integral Methods
He goes on to say that if such were so, no information could be deduced in problems with boundary conditions on both sides of the origin, and ‘in some cases results have had an accuracy far greater than there was any apparent reason to expect’. Jeffreys then considers two problems. In the first, a perfect reflector exists at x = b > 0 and at x = − a < 0, yielding an eigenvalue problem. 4) from right to left, though Jeffreys strenously denies that such is the case. 3); the reason for this may ultimately be traced to the fact that there is no energy transmission associated with a standing wave pattern.
J. solution from one side of the transition point to the other by tracing it round the point in the complex plane. When the real axis was again reached, the condition that the solution must be real provided sufficient information for the deduction of the appropriate connection formula. Langer has pointed out the weaknesses of such a treatment. Kemble , in his text, employed the same ideas, but more rigorously. Furry  (1947) appears to have been the first author to have treated the idea of the Stokes phenomenon seriously.
J. solutions and for more general approximations. Many writers treat the subject of phase-integral methods without concerning themselves with this question, but this stands as an inherent weakness of their treatment. For example, Budden  in his comprehensive account of the subject in his text, Radio Waves in the Ionosphere, realizes this weakness but nevertheless follows the majority of writers and thereby fails to standardize a large parameter in terms of which parameter the uniformity of the approximations may be examined, and reviewers [57, 108] have called attention to this fact.
An Introduction to Phase-Integral Methods by John Heading