[J3] More Bessel functions

[Van Snyder]

On Wed, 2021-01-20 at 20:31 +0000, Bill Long via J3 wrote:
> > Yes, Fortran needs a high quality implementation of all of these (and more), readily available to the user.
> 
> There are professionally written libraries, like NAG, already
> available.  Also LaPack for some cases.  Perhaps we should argue for
> robust Fortran interfaces instead, akin to the mpi_f08 module for
> MPI. 

Eleven years ago, I advocated for an optional part of 1539 that would
provide standard interfaces for special functions.

Having the code available, free or fee, isn't the only issue. Having
standard interfaces is also important.

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