Re: Expand[] on the RHS of a rule
- To: mathgroup at yoda.physics.unc.edu
- Subject: Re: Expand[] on the RHS of a rule
- From: Silvio Levy <levy at geom.umn.edu>
- Date: Thu, 28 May 92 09:34:26 CDT
> From: athos at warp.stanford.edu (Athos Kasapi) (see below) > Has anybody found a way to work around the problem that Expand does not > work when it is on the right hand side of a rule? For example, if I > define > > p := Sqrt[ (a + b) (c + d) ] > > and then apply the rule > > p /. Sqrt[ x_ y_ ] -> Sqrt[ Expand[ x y ] ] > > Then all I get back is > > Sqrt[ (a + b)(c + d) ] The problem is not with Expand; you have the wrong kind of rule. Try :> instead of -> Silvio