Re: Grouping terms under the radical

*To*: mathgroup at smc.vnet.net*Subject*: [mg120079] Re: Grouping terms under the radical*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Fri, 8 Jul 2011 04:49:56 -0400 (EDT)*Reply-to*: hanlonr at cox.net

expr = Sqrt[2*n] Sqrt[2]*Sqrt[n] expr /. Sqrt[x_] Sqrt[y_] -> HoldForm[Sqrt[x*y]] HoldForm[Sqrt[2*n]] % // ReleaseHold Sqrt[2]*Sqrt[n] Bob Hanlon ---- paulvonhippel at yahoo <paulvonhippel at yahoo.com> wrote: ============= This must be a classic question. When I input Sqrt[(2 n)] Mathematica displays the output as Sqrt[2] Sqrt[n] -- i.e., both 2 and n are under their own radical. The display of output doesn't change if I impose the assumption that n > 0. This is fine from a mathematical point of view, but it looks unconventional when pasted into a paper. It seems to me most authors would keep the 2 and the n under a common radical -- how can I get Mathematica to do the same? Thanks!