MathGroup Archive 1996

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  • To: mathgroup at
  • Subject: [mg3480] Backwards?
  • From: Artur KUO <artur at>
  • Date: Sat, 16 Mar 1996 22:38:46 -0500
  • Sender: owner-wri-mathgroup at

Hello, Mr. Christensen,

I would like to ask a question please.
How can I let Mathematica do this:

1) c[x,y]*a[x]*D[b[x],x]+c[x,y]*b[x]*D[a[x],x]+d[x,y]
   --->c[x,y]*D[a[x]*b[x],x]+d[x,y]  ?
   It's backward-chainrule.
2) If I let u^2+v^2:=1, how cann I do:

   a*u^2+a*v^2==a*1==a   ?

In my Equations the terms are much more complicate 
like above. I have tried with "/.", but did not work.

Thanks a lot.

Artur Kuo


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