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i wanna know if a null matrix would be called an upper triangular or lower triangular. <span style="font-size: smaller;" class="autosigned">—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/117.200.51.168|117.200.51.168]] ([[User talk:117.200.51.168|talk]]) 07:29, 17 March 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->
==square matrix==
Contrary to what this article claims, an upper-triangular matrix does NOT necessarily need to be square. I welcome someone who is familiar enough with the upper/lower definitions to fix this error.
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