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I understand \romannumeralk when k is positive. However, I have seen \romannumeral0 in a few codes but I do not understand its use. What is it?

Example:

\romannumeral0\expandafter\xintzapspaces\expandafter{\MAT_tmpa};!;%

this is line 28 of the code of the section ROW REDUCTION (INITIAL) ANSWER of this post

Chilote
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  • Can you show these "few codes," or at least an example of it? – Werner Dec 29 '21 at 06:47
  • I just did, thanks – Chilote Dec 29 '21 at 07:35
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    Related/duplicate: https://tex.stackexchange.com/q/473621/4427 See also https://tex.stackexchange.com/search?q=romannumeral+trick – egreg Dec 29 '21 at 09:48
  • Thanks, @egreg. So the \numeral trick is no longer required because we have \expanded now. Correct? How \expanded can be used to modify the line of the example? – Chilote Dec 29 '21 at 13:53
  • @Chilote \expanded is more powerful, but \romannumeral expansion may have its uses nonetheless. – egreg Dec 29 '21 at 15:56
  • Note that \romannumeral0 is not safe, better would be \romannumeral\^^@` instead, otherwise you might have issues with digits following the 0. – Skillmon Dec 29 '21 at 18:02

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