Simplification of vector and scalar products

*To*: mathgroup at smc.vnet.net*Subject*: [mg39613] Simplification of vector and scalar products*From*: John Stokes <john at geomatics.kth.se>*Date*: Wed, 26 Feb 2003 02:41:52 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

I want to simplify vector and scalar products as for instance 6 (a / 2) x b //Simplify where a and b are assumed to be vectors and "x" is the vector product.. Simplify and FullSimplify do nothing, nor does the following command change anything: 6 (a / 2) x b /. p_ Cross[a_ / q_ , b_] => p Cross[a, b] / q The simplification is only performed when explicit numbers are introduced: 6 (a / 2) x b /. 6 Cross[a_ / 2 , b_] => 6 Cross[a, b] / 2 thus giving the result 3 a x b How do I proceed? John Stokes