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Re: combinations of pure functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg16616] Re: combinations of pure functions
  • From: Paul Abbott <paul at physics.uwa.edu.au>
  • Date: Fri, 19 Mar 1999 12:53:47 -0500
  • Organization: University of Western Australia
  • References: <7cldkq$9n2@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Gianluca Gorni wrote:

> Unfortunately the suggestion fails if we just change +
> into - in op:
> 
>    op2 = Identity - (D[#,x]&)
> 
> What can one do? 

Move the minus sign:

	op2 = Identity + (D[-#,x]&) 

	Through[op2[x^2],Plus]

Cheers,
	Paul

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Paul Abbott                                   Phone: +61-8-9380-2734
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AUSTRALIA                        http://www.physics.uwa.edu.au/~paul

            God IS a weakly left-handed dice player
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