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remove higher orders terms from mathemtica's result

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90916] remove higher orders terms from mathemtica's result
  • From: kem <kemelmi at gmail.com>
  • Date: Tue, 29 Jul 2008 06:09:54 -0400 (EDT)

Hi,
Given this:

K = (1+vy) (zx+wx)  + vx (zy+wy);
Expand[K^2]

Is it possible to remove automatically the 3rd and 4th orders from the
result of  'Expand[K^2]' ?

By 3rd order I mean terms like: 2 wy zy vx^2  etc. (all terms with sum
of the degrees of derivatives of u,v,w is = 3)
By 4th order:  wy^2 vx^2  etc.   (sum of degrees of u,v,w = 4)


Thanks





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