Is there a way to use align and tag inline together? Here are some examples of what I tried:



x^2 &= 1 \\
x   &= -1,1 \tag{*} \\


It gives me an error, however, telling me \tag not allowed.

  • \begin{align} inside $$ will generate an error (and you should not use $$ in latex anyway). Perhaps you are looking for the first example, but without $$ (hard to tell from your question. Oct 29, 2016 at 11:23
  • Well, it doesn't really matter which one I use. I did realize that only \begin{aligned} works inside the $$. but the problem is that it doesn't accept tags. Here's the error I get: \tag not allowed here Oct 29, 2016 at 11:25
  • @DavidCarlisle Thank you for clearing it up (I realized why my question was unclear from your comment). I updated my question so it's not as unclear. Oct 29, 2016 at 11:27
  • you can't number inline math as an equation? Oct 29, 2016 at 11:32
  • Your new MWE produces ! LaTeX Error: Environment aligned undefined. Oct 29, 2016 at 11:33

1 Answer 1


You need align or align* (and never use $$ in latex).

x^2 &= 1 \\
x   &= -1,1 \tag{*} 

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