#15019: Don't allow differentiation with respect to order in Bessel functions
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Reporter: eviatarbach | Owner:
Type: defect | Status: needs_review
Priority: blocker | Milestone: sage-5.11
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: Evitar Bach | Reviewers: Volker Braun
Report Upstream: N/A | Work issues:
Branch: | Dependencies:
Stopgaps: |
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Changes (by {'newvalue': u'Evitar Bach', 'oldvalue': ''}):
* reviewer: => Volker Braun
* author: => Evitar Bach
Old description:
> This is wrong:
>
> {{{
> sage: var('nu z')
> (nu, z)
> sage: bessel_J(nu, z).diff(nu)
> -1/2*bessel_J(nu + 1, z) + 1/2*bessel_J(nu - 1, z)
> sage: bessel_J(nu, z).diff(z)
> -1/2*bessel_J(nu + 1, z) + 1/2*bessel_J(nu - 1, z)
> }}}
New description:
This is wrong:
{{{
sage: var('nu z')
(nu, z)
sage: bessel_J(nu, z).diff(nu)
-1/2*bessel_J(nu + 1, z) + 1/2*bessel_J(nu - 1, z)
sage: bessel_J(nu, z).diff(z)
-1/2*bessel_J(nu + 1, z) + 1/2*bessel_J(nu - 1, z)
}}}
Apply [attachment:trac15019.patch]
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Comment:
Looks good to me
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Ticket URL: <http://trac.sagemath.org/ticket/15019#comment:2>
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