numerically satisfactory pairs
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11: 2.9 Difference Equations
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►As in the case of differential equations (§§2.7(iii), 2.7(iv)) recessive solutions are unique and dominant solutions are not; furthermore, one member of a numerically satisfactory pair has to be recessive.
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12: 2.7 Differential Equations
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►This kind of cancellation cannot take place with and , and for this reason, and following Miller (1950), we call and a numerically satisfactory pair of solutions.
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►This is characteristic of numerically satisfactory pairs.
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►In oscillatory intervals, and again following Miller (1950), we call a pair of solutions numerically satisfactory if asymptotically they have the same amplitude and are out of phase.
13: 12.14 The Function
14: 9.13 Generalized Airy Functions
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►The function on the right-hand side is recessive in the sector , and is therefore an essential member of any numerically satisfactory pair of solutions in this region.
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15: 13.2 Definitions and Basic Properties
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►Fundamental pairs of solutions of (13.2.1) that are numerically satisfactory (§2.7(iv)) in the neighborhood of infinity are
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►A fundamental pair of solutions that is numerically satisfactory near the origin is
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►When , a fundamental pair that is numerically satisfactory near the origin is and
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►When , a fundamental pair that is numerically satisfactory near the origin is and
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16: 14.20 Conical (or Mehler) Functions
17: 13.14 Definitions and Basic Properties
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►Fundamental pairs of solutions of (13.14.1) that are numerically satisfactory (§2.7(iv)) in the neighborhood of infinity are
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►A fundamental pair of solutions that is numerically satisfactory in the sector near the origin is
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18: 15.10 Hypergeometric Differential Equation
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►It has regular singularities at , with corresponding exponent pairs
, , , respectively.
When none of the exponent pairs differ by an integer, that is, when none of , , is an integer, we have the following pairs
, of fundamental solutions.
They are also numerically satisfactory (§2.7(iv)) in the neighborhood of the corresponding singularity.
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►The three pairs of fundamental solutions given by (15.10.2), (15.10.4), and (15.10.6) can be transformed into 18 other solutions by means of (15.8.1), leading to a total of 24 solutions known as Kummer’s solutions.
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