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Why does the page for "Simultaneously diagonalizable" redirect here, when there's no mention of the topic here? 131.215.105.153 ( talk) 20:47, 2 February 2009 (UTC) reply

In the opening, it says, "Thus, the matrix D = (di,j) with n columns and n rows is diagonal if:", but I think it should say "if and only if", otherwise it's not making a strong enough claim. Can someone confirm this? If so, please make the change. —Preceding unsigned comment added by 69.207.156.13 ( talk) 14:16, 11 March 2009 (UTC) reply

This article might be the right place to mention the operator ${\displaystyle diag(u)}$ that takes creates an ${\displaystyle (n\times n)}$ diagonal matrix ${\displaystyle D}$ from an ${\displaystyle (n\times 1)}$ vector ${\displaystyle u}$ such that ${\displaystyle D_{ii}=u_{i}}$. Or perhaps it deserves an article of its own?

It's already in use on wikipedia:

/info/en/?search=Commutator_subspace

— Preceding unsigned comment added by Michael.Clerx ( talk • contribs) 05:44, 15 October 2014 (UTC) reply

Support mentioning diag() in the present article. fgnievinski ( talk) 19:16, 21 November 2023 (UTC) reply