Talk:Conjugate transpose
Bug in Factor
Ruby and Octave give the same answer.
Factor gives a different answer.
If Ruby and Octave are correct, then is a normal matrix. If Factor is correct, then is not a normal matrix. Factor is wrong. Factor's matrix multiplication has a bug: Factor confuses Hermitian inner product with scalar product, and calculates A × B in place of A × B. --Kernigh 00:30, 17 March 2012 (UTC)
Ruby bug fixed in head
https://bugs.ruby-lang.org/issues/6290#change-25888
Matrix#hermitian?
has been fixed in ruby 2.0