Infinite Determinants in the Theory of Mathieus And Hills Equations
Infinite Determinants in the Theory of Mathieus And Hills Equations
W Magnus
The book Infinite Determinants in the Theory of Mathieus And Hills Equations was written by author W Magnus Here you can read free online of Infinite Determinants in the Theory of Mathieus And Hills Equations book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Infinite Determinants in the Theory of Mathieus And Hills Equations a good or bad book?
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T2[. .. ]. In particular, if a ■ 0, b « 1, we find that (U) y2(x;o. , t) - / e^^"^ G(x, ^, t) d^), -X where G can be expanded in a power series in t which is everywhere convergent . As a function of the real variables ^ and x, G satisfies the partial differen- tial equation 2 2 (5) ^ - -^ + Stcos 2x G - 0. dx 3^ 3G (6) G(x;ix, t) » X, QtJ^vi'it. X, t) -It sinx cosx . The proof of Theorem U can be derived from Theorem X, p. 13 in the book by Paley and Wiener [^8 J . According to this theorem, th...e following two classes of functions are identical: (l) The class of all entire functions F(z) satisfying (7) |F(z)| - o(e^'^l) ; - 31 - (II) the class of all entire functions of the form +A (8) F(z) =/ f(u) e^^V, -A where f(u) belongs to Lp over (-A, A), It may suffice to prove (U), (5) and (6). Putting fn\ t \ sin 2cox (9) u^(x, co) - —^ and ) ^ (10) u^(x, co) - - ^ y sin 2a)(x-f) cos24 u^__j^(4) d?, o we find 00 (n) 72^*'"**^ " 21 ^^n^" » n«0 where the series on the right-hand side converges for all values of t.
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