P-function
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1: 14.27 Zeros
§14.27 Zeros
► (either side of the cut) has exactly one zero in the interval if either of the following sets of conditions holds: …For all other values of the parameters has no zeros in the interval . ►For complex zeros of see Hobson (1931, §§233, 234, and 238).2: 14.21 Definitions and Basic Properties
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►Standard solutions: the associated Legendre functions
, , , and .
and exist for all values of , , and , except possibly and , which are branch points (or poles) of the functions, in general.
When is complex , , and are defined by (14.3.6)–(14.3.10) with replaced by : the principal branches are obtained by taking the principal values of all the multivalued functions appearing in these representations when , and by continuity elsewhere in the -plane with a cut along the interval ; compare §4.2(i).
The principal branches of and are real when , and .
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►The generating function expansions (14.7.19) (with replaced by ) and (14.7.22) apply when ; (14.7.21) (with replaced by ) applies when .