Way to evaluate D[(1-x^2)y''[x],{x,n}] ?
- To: mathgroup at smc.vnet.net
- Subject: [mg14914] Way to evaluate D[(1-x^2)y''[x],{x,n}] ?
- From: Dr Phillip Kent <p.kent at ic.ac.uk>
- Date: Wed, 25 Nov 1998 17:48:35 -0500
- Organization: Imperial College
- Sender: owner-wri-mathgroup at wolfram.com
I'm wondering if and how to make Mathematica evaluate derivatives like
D[(1-x^2)y''[x],{x,n}]
y[x] is an unspecified function, n is a +ve integer.
It seems as though the system ought to "know" that this reduces to three
terms only, provided that n is constrained?
-Phillip
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Dr Phillip Kent | tel: +44 (0)171 594 8503
The METRIC Project | fax: +44 (0)171 594 8517
Mathematics Department |
Imperial College | p.kent at ic.ac.uk
London SW7 2BZ, U.K. | http://metric.ma.ic.ac.uk/
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"Behaviour can be understood only as the history of behaviour"
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