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Is there a way to use align and tag inline together? Here are some examples of what I tried:
\documentclass[]{article}
\begin{document}
$$\begin{aligned}
x^2 &= 1 \\
x &= -1,1 \tag{*} \\
\end{aligned}$$
\end{document}
It gives me an error, however, telling me \tag not allowed.
You need align or align* (and never use $$ in latex).
\documentclass{amsart}
\begin{document}
\begin{align*}
x^2 &= 1 \\
x &= -1,1 \tag{*}
\end{align*}
\end{document}
\begin{align}inside$$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.\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! LaTeX Error: Environment aligned undefined.