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

**Follow-Ups**:**Re: remove higher orders terms from mathemtica's result***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>