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Re: Known recursion link to Hermite polynomials not solved in Mathematica
*To*: mathgroup at smc.vnet.net
*Subject*: [mg69583] Re: Known recursion link to Hermite polynomials not solved in Mathematica
*From*: Paul Abbott <paul at physics.uwa.edu.au>
*Date*: Sat, 16 Sep 2006 03:50:22 -0400 (EDT)
*Organization*: The University of Western Australia
*References*: <ee647q$5nb$1@smc.vnet.net> <eebd4g$l8m$1@smc.vnet.net> <eee0d6$6f3$1@smc.vnet.net>
In article <eee0d6$6f3$1 at smc.vnet.net>,
Roger Bagula <rlbagula at sbcglobal.net> wrote:
> With Bessel function recurrences you are allowed negative and rational
> quantum
> numbers, but not with HermiteH. What appears to happen is that the
> normal integral function which is called the error function
> behaves in a way to make this up for these negative or integral states.
> The two types ( Bessel and Hermite-error function) seem to be mirrors
> of each other except for this.
This is not clear to me -- nor I expect to most readers of this group.
> 1) The Hermite-error function type
> a[n]=a0* a[n - 1] + (b0*n +c0) a[n - 2]: a0,b0,c0 Integers
> 2) The Bessel type is:
> a[n]=(a0*n+b0) a[n - 1] + c0 a[n - 2]: a0,b0,c0 Integers
To be consistent, surely you should have
a[n]=(b0*n+a0) a[n - 1] + c0 a[n - 2]: a0,b0,c0 Integers
so that the relationship between the recurrences is clear.
> The result is more a reflection of the limitations of the current
> mathematical notation in Mathematica than the actual sequential
> recursions.
What limitation of mathematical notation in Mathematica?
> It seems strange that the mathematics of probability ( which is widely
> used in many fields) should be less solvable ( Using the RSolve level of
> discrete functions) in Mathematica than that of
> the Bessel function which isn't all that used in the real world.
What on earth do you mean? The Bessel function appears everywhere in the
real world! One nice example: the natural shape of a horn is a bessel
function. See
http://www-ccrma.stanford.edu/~jos/tiirts/Horn_Reflectance_Filter.html
And what about waves in 2D, and normal modes of a drum?
> As far as I know no one ( or can search) has noticed or reported this
> type of recurrence or this symmetry property before.
If you can more clearly describe the symmetry property you see, I expect
that you will find it is well known ...
Cheers,
Paul
_______________________________________________________________________
Paul Abbott Phone: 61 8 6488 2734
School of Physics, M013 Fax: +61 8 6488 1014
The University of Western Australia (CRICOS Provider No 00126G)
AUSTRALIA http://physics.uwa.edu.au/~paul
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