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Factorising operators??

  • To: mathgroup at
  • Subject: [mg30959] Factorising operators??
  • From: Mat Bowen <m.k.bowen at>
  • Date: Fri, 28 Sep 2001 03:55:08 -0400 (EDT)
  • Organization: Loughborough University, UK
  • Sender: owner-wri-mathgroup at


I'm new to mathematica and looking for help with the following:

I have two operators, a and b, that function as approximations to first and
second order derivatives. I can write (a+b)[x] and then use Through[%,Plus]
to generate a[x]+b[x] but I want to do the reverse, ie. Get mathematica to
output (a+b)[x] if I give it a[x]+b[x]. Is there any way (preferably simple)
to do this which will also work with more general cases ie. a[x]+5b[x]+const
c[x] should produce (a+5b+const)[x]

Mat Bowen

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