Talk:Degenerate matrix

I could not find any reference for a zero row matrix. Does it exist? What does it mean? physicistjedi 23:37, 16 March 2006 (UTC)


 * The reply below is copied from User talk:Physicistjedi.
 * If I remember correctly, I saw the one-line article you created, and I thought that it was odd, as I did not remember ever seeing this term. In fact, I thought "degenerate matrix" referred to a matrix with degenerate eigenvalues (eigenvalues with multiplicity greater than 1). However, when looking for references, I could not find any quickly; instead, I found references for the zero rows / columns meaning. Embarrassingly, I don't remember the reference (I didn't write it because degenerate matrix is a disambiguation page, though I now regret this). The only reference I can find now is the first Google hit for "degenerate matrix", which says: "Like all definitions so far, they even work for degenerate matrices with no rows and no columns" . However, it seems the common name is "empty matrix". It is not very important, but useful in the same way as the empty sum and the empty product. There is even an article about it.
 * In view of this information, I made degenerate matrix into a redirect to invertible matrix. Thanks for keeping an eye on me! Cheers, Jitse Niesen (talk) 07:27, 17 March 2006 (UTC)