…
►The Pollaczek polynomials of type 3 are defined by the recurrence
relation (in first form (
18.2.8))
…the recurrence
relation of form (
18.2.11_5) becomes
…
►As in the coefficients of the above recurrence
relations
and
only occur in the form
, the type 3 Pollaczek polynomials may also be called the
associated type 2 Pollaczek polynomials by using the terminology of §
18.30.
…
►we have the explicit representations
…
►This expansion is in terms of the
Airy function
and its derivative (§
9.2), and is uniform in any compact
-interval in
.
…
…
►‘✓’ indicates that a software package implements the
functions in a section; ‘
a’ indicates available
functionality through optional or add-on packages; an empty space indicates no known support.
…
►In the list below we identify four main sources of software for computing special
functions.
…
►
Open Source Collections and Systems.
These are collections of software (e.g. libraries) or interactive systems of
a somewhat broad scope. Contents may be adapted from research software or may
be contributed by project participants who donate their services to the project.
The software is made freely available to the public, typically in source code form.
While formal support of the collection may not be provided by its developers,
within active projects there is often a core group who
donate time to consider bug reports and make updates to the collection.
…
►
Commercial Software.
Such software ranges from a collection of reusable software
parts (e.g., a library) to fully functional interactive computing environments
with an associated computing language. Such software is usually professionally
developed, tested, and maintained to high standards. It is available for purchase,
often with accompanying updates and consulting support.
…
►
Guide to Available Mathematical Software
A cross index of mathematical software in use at NIST.
…
►where
…
►Any nontrivial real solution of (
32.11.4) that satisfies (
32.11.5) is asymptotic
to
, for some nonzero real
, where
denotes the
Airy function (§
9.2).
Conversely, for any nonzero real
, there is a unique solution
of (
32.11.4) that is asymptotic
to
as
.
…
►The connection formulas
relating (
32.11.25) and (
32.11.26) are
…
►Now suppose
.
…
…
►These are elementary
functions in Case I, and
Airy functions (§
9.2) in Case II.
…
►Corresponding
to each positive integer
there are solutions
,
, that are
on
, and as
…
►For
and
see §
9.2.
…
►of smallest absolute value, and define the
envelopes of
and
by
…
►For other examples of uniform asymptotic approximations and expansions of special
functions in terms of
Airy functions see especially §
10.20 and §§
12.10(vii),
12.10(viii); also §§
12.14(ix),
13.20(v),
13.21(iii),
13.21(iv),
15.12(iii),
18.15(iv),
30.9(i),
30.9(ii),
32.11(ii),
32.11(iii),
33.12(i),
33.12(ii),
33.20(iv),
36.12(ii),
36.13.
…
…
►
. Airy Function
…
►The Stokes set is itself a cusped curve, connected
to the cusp of the bifurcation set:
…
►They generate a pair of cusp-edged sheets connected
to the cusped sheets of the swallowtail bifurcation set (§
36.4).
…
►This consists of three separate cusp-edged sheets connected
to the cusp-edged sheets of the bifurcation set, and
related by rotation about the
-axis by
.
…
►Red and
blue numbers in each region correspond, respectively,
to the numbers of
real and
complex critical points that contribute
to the asymptotics of the canonical integral away from the bifurcation sets.
…
…
►The
function
has a smooth amplitude.
…
►Define a mapping
by
relating
to the normal form (
36.2.1) of
in the following way:
…
►For example, the diffraction catastrophe
defined by (
36.2.10), and corresponding
to the Pearcey integral (
36.2.14), can be approximated by the
Airy function
when
is large, provided that
and
are not small.
…
►For
and
see §
9.2.
…The coefficients of
and
are real if
is real and
is real analytic.
…