Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

Mathematica bug??

• To: mathgroup at smc.vnet.net
• Subject: [mg100540] Mathematica bug??
• From: oshaughn <oshaughn at gravity.psu.edu>
• Date: Sun, 7 Jun 2009 05:02:16 -0400 (EDT)

{{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?

• Follow-Ups:
  • Re: Mathematica bug??
    • From: Murray Eisenberg <murray@math.umass.edu>
  • Re: Mathematica bug??
    • From: "Matthias Bode" <lvsaba@hotmail.com>
  • Re: Mathematica bug??
    • From: DrMajorBob <btreat1@austin.rr.com>