On the Functions of the Parabolic Cylinder

Cover On the Functions of the Parabolic Cylinder
On the Functions of the Parabolic Cylinder
David I Epstein
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19) \^rK) t). V. I(Y>{) for V = - X- + i^-, X real and tending to +oo. For X -s> oo. , -1 nX fX. In ^. L/2. Ix(Y«)^-l/2-ix(M> ^ 2" exp^- | log X . ^ - ^r^rU *V (2. 20) i(^-X* (^)^/^(4 *^)) I • The corresponding expression for X ->-oo can be obtained by putting X » -t and letting t -> +oo, or by interchanging ^ and vi and letting \. ->oo as above. 3, Special one-valued solutions Before entering upon a discussion of the addition theorems it will be of some value to remark on the equation of one-v...aluedness. From the transformation (2, 3) we see that a point in the (x, y)-5ystem has two pairs of coordinates in the (^, y^ ) -system, namely (C>>1 ) and i-E, f-^)» Thus, to say that the function F(4, >y ) is one-valued in the (x, y)-plane means that F(^, >7) » F(-C, -v]). Therefore, a product fj^(YC)f2(Y">7) is a one-valued function in the (x, y)-plane if and only if the functions f and fp are both even or both odd. Given f, (Y?) and f2(Y^)» then clearly - 9 - (3. 1) f^(Y4)f2(Y^) + f^i-r^)f^i'ryi) is a one-valued solution of the wave equation, although one in which the variables are not completely separated.

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