Re: Mathematica bug??

*To*: mathgroup at smc.vnet.net*Subject*: [mg100561] Re: Mathematica bug??*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Mon, 8 Jun 2009 02:05:46 -0400 (EDT)*References*: <h0fvlb$rct$1@smc.vnet.net>

I get a different answer: {{1/Sqrt[1 - 2/r], 0, 0, 0}, {0, Sqrt[1 - 2/r], 0, 0}, {0, 0, 1/r, 0}, {0, 0, 0, Csc[\[Theta]]/r}} This is the correct answer. What version of Mathematica were you using? Have you tried this on a fresh kernel? Cheers -- Sjoerd On Jun 7, 11:01 am, oshaughn <oshau... at gravity.psu.edu> wrote: > {{Sqrt[1 - 2/r], 0, 0, 0}, {0, 1/Sqrt[1 - 2/r], 0, 0}, {0, 0, r, > 0}, {0, 0, 0, r Sin[\[Theta]]}} // Inverse > > gives > > {{0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 1/r, 0}, {0, 0, 0, Csc[\[Theta]]/ > r}} > > with no warnings. This is a *diagonal* matrix that should be > trivially invertible. > > Does anyone know why Inverse has catastrophically failed here?