The book The Discriminant of Hills Equation was written by author W Magnus Here you can read free online of The Discriminant of Hills Equation book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Discriminant of Hills Equation a good or bad book?
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We wish to estimate the absolute value of ^ n=l \^-n — X(X-n2) ^ for X ^^ oo . In the case of a finite sum, ve would have |d(X)| = ^(X )- Now all we can do is to prove (5. 21) |d(X)| = (^{\-^^^) ( X^ oo). 2 To do this, let X = cd and observe that / 2 i I e n g g sin nx dx = - 2(-l; — and therefore 2 2 '^n'='-n (x> -n 17 - XD(X) = - i I I ^ (-l)"^ n gj^S_^ sin nxl e '^^ dx = - I I k r 10)" y (51 n g^g_^ Sin nx I dx ~n~-n n=l Integrating by parts, we find ^^^^^ ^ ~ ^ I ^^^'"^ " ^■^ I ^ "^ ^n^-n ^...°^ "^ ' ^ Because of (5. 20), the integrand is a continuous function of x which is boiinded independently of od. This proves (5-21). Similar arguments can be applied in order to extend the estimates (5. L) and (5-2) to the case where infinitely many of the g are different from zero. However, we shall not go into the details, which are rather tedious. 18 6. Some relations between the characteristic values . We shall prove the following results: Theorem 3 . Let the roots of A(X) + 2 and of A(X) - 2 be denoted as In Section 2 .
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