Talk:Main diagonal
 | This article is rated Stub-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
| |||||||||||
Notation edit
Is there a standard notation for the main diagonal of matrix M? Do people say or something? --Doradus (talk) 15:35, 2 September 2009 (UTC)
- I don't know of any. Scientific29 (talk) 10:07, 12 April 2014 (UTC)
Inadequate reference edit
The article says, "In linear algebra, the main diagonal (sometimes principal diagonal, primary diagonal, leading diagonal, or major diagonal) of a matrix {\displaystyle A} A is the collection of entries {\displaystyle A_{i,j}} A_{i,j} where {\displaystyle i=j} i=j." It also shows non-square matrices and indicates a main diagonal in them in red.
https://wikimedia.org/api/rest_v1/media/math/render/svg/9224f95b8332a444021043d15593c5e41e4321fd
But the reference (http://mathworld.wolfram.com/Diagonal.html) specifically mentions that the main diagonal exists in a SQUARE matrix. It does not, however, say that a main diagonal cannot exist in non-square matrices. Where is the reference that mentions that leading diagonals can be present in non-square matrices? — Preceding unsigned comment added by Oitijhya (talk • contribs) 11:58, 19 May 2018 (UTC)
This article is in dire need of other references. I wouldn't call MathWorld a "reliable source". Especially for the names of the diagonal and antidiagonal: some user came up with "Harrison diagonal," which is nowhere to be found on Google, and their claim stood up for half a year. – OfficialURL (talk) 07:44, 1 December 2021 (UTC)