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Re:Don’t invert that matrix (2010) by x0x0 on Thursday May 12, 2016 @06:31PM (#11687331)
And not only are the matrices small, they're probably known (or assumed) to be well-conditioned.

Inverting even a small hilbert matrix will probably go boom.

Re:Don’t invert that matrix (2010) by GFK_of_xmaspast on Thursday May 12, 2016 @09:45PM (#11688099)
Not just well conditioned, but special orthogonal.