With the following code :



A & = B  \label{eq:first}\\
  & = C \tag{a} 

Reference to \eqref{eq:first}.


I obtain the following result:

enter image description here

With \tag* instead of \tag, I have the expected result.

Of course, it doesn't seem logical to put \tag{a} without the option showmanualtags but the result seems strange.

  • It might be a nice puzzle to solve but: (1) I can't see a reason for mixing numbers and manual tags in the same display; (2) I can't see a reason for not showing manual tags unless referred to; (3) I can't see a reason for showonlyrefs. Reasons are in order of importance. – egreg Jul 20 '18 at 11:40

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