*To*: mathgroup@smc.vnet.net*Subject*: [mg11858] Re: fractional simplification*From*: Allan Hayes <hay@haystack.demon.co.uk>*Date*: Fri, 3 Apr 1998 03:45:20 -0500*References*: <6fq3or$cso@smc.vnet.net>

Pierre MARTINEU wrote: > > We didn't manage to simplify the symbolic expression : "a . b/a" under > Mathematica 2.2. > We've tried using different functions like 'simplify' ...without success > ! > Is it normal ? > Do you have any solutions to solve this problem ? Pierre: Could you explain what you want the answer to be please? a.b/a is interpreted as Dot[a, b]/a, where Dot is the vector inner product, not Times[a,b]/a. For explicit vectors we get {a1,a2}.{b1,b2}/{a1,a2} a1 b1 + a2 b2 a1 b1 + a2 b2 {-------------, -------------} a1 a2 You may want {a1,a2}.({b1,b2}/{a1,a2}) b1+b2 We will probably havw to write a rule. -- Allan Hayes Training and Consulting Leicester, UK hay@haystack.demon.co.uk http://www.haystack.demon.co.uk voice: +44 (0)116 271 4198 fax: +44 (0)116 271 8642