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March 22nd, 2015, 04:41 AM  #1 
Newbie Joined: Mar 2015 From: bulgaria Posts: 1 Thanks: 0  ultra diagonal matrix, super diagonal matrix, sub diagonal matrix
Hi There! What are ultra super and subdiagonal matrices? Thanks Silvia 
March 22nd, 2015, 05:25 AM  #2 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 
The "super diagonal" of a matrix is the diagonal of entries immediately above the main diagonal. The "sub diagonal" of a matrix is the diagonal of entries immediately below the main diagonal. A "super diagonal matrix" is a matrix that has nonzero entries only on its main diagonal and the diagonal immediately above that. A "sub diagonal matrix" is a matrix that has nonzero entries only on its main diagonal and the diagonal immediately below that. I have never seen the phrase "ultra diagonal matrix" nor am I able to look it up. 
March 22nd, 2015, 05:28 AM  #3 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond  silviatodorof, please do not post duplicate threads.


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diagonal, matrix, super, ultra 
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