I want to give a name to an equation which is "the reverse of ن"

i'm using polyglossia when I write






it gives me many errors at end{equation}

the first is

undefined control sequence.

but if a delete \tag there is no error , how to de please to give this name to the equation?

Thank you

  • 1
    You only provided an untestable fragment, I completed it to a document for testing but I get no error, please edit the example so it makes an error and show the error that you get (the form you show is not the format of a tex error message) Jul 23 '19 at 12:11
  • @DavidCarlisle i edited the message Jul 23 '19 at 12:43
  • The posted code does not produce the error you state it produces an undefined command error ! Undefined control sequence. <argument> ...(\kern \z@ \ignorespaces \eflectbox {ن}\unskip \@@italiccorr )... l.42 \end{equation} because of the typo \eflectbox instead of \reflectbox Jul 23 '19 at 12:46
  • I get no error with \protect\reflectbox. The parentheses are reversed, though.
    – egreg
    Jul 23 '19 at 12:55
  • this code is not the first , I reduce it for the question Jul 23 '19 at 13:03

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