[Newbie:] How to discard higher orders of variables?

• Subject: [Newbie:] How to discard higher orders of variables?
• From: Stavros Macrakis
• Date: Wed, 11 Jul 2007 21:54:23 -0400

Another technique to consider for multiple variables <<1 is

          taylor( ..., [x,y,z], 0, 5)

which truncates at terms beyond x^a*y^b*z^c where a+b+c > 5

e.g.

         taylor (  (k+x+y)^(1/2) - (l+x^2+y^2)^(1/4) , [x,y], 0, 1) =>

              -l^(1/4)+sqrt(k)+(sqrt(k)*x+sqrt(k)*y)/(2*k)

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