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Re: Mathematica bug??

• To: mathgroup at smc.vnet.net
• Subject: [mg100562] Re: Mathematica bug??
• From: "VMCM1905" <VMCM1905 at gmail.com>
• Date: Mon, 8 Jun 2009 02:05:57 -0400 (EDT)
• References: <h0fvlb$rct$1@smc.vnet.net>

"oshaughn" <oshaughn at gravity.psu.edu> wrote in message 
news:h0fvlb$rct$1 at smc.vnet.net...
> {{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.
>

Works for me. I get:
{{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}}



What version are you using? Have you cleared any variables? Try 
rebooting the kernal.