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MathGroup Archive 2004

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Assumption -> quadratic multivariate function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg47225] Assumption -> quadratic multivariate function
  • From: damir at 2d.com (Damir Herman)
  • Date: Wed, 31 Mar 2004 02:58:15 -0500 (EST)
  • References: <c40spe$mqu$1@smc.vnet.net> <c48qql$lpf$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Peter, 

Thank you very much for the tip. However, instead of

>    f /: Dt[f, ___, {x | y, 3}, ___] = 0;

I think the bulletproof assignment would be

      f/: Dt[f, ___, {_, k_/; k>= 3}, ___] = 0;

> I suppose you would like to add
>    x/: Dt[x, ___, y | {y, _}, ___] = 0;
>    y/: Dt[y, ___, x | {x, _}, ___] = 0;
> too ;-)

Is this really necessay? I thought that Mathematica automatically 
assumes the variables are independent.

Damir


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