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This question already has an answer here:

I am typing in texmaker but using \tag{} is not giving me the desired result. It shows an error. Here is sample

\textbf{Proof-} It is clear that $Inn(G)\subseteq Aut_U(G)$. 
So we let  $\varphi \in Aut_U(G)$ i.e. $\varphi(g)=u^{-1}gu$ for some
$u\in U(\mathbb{Z}G)$\\
$\therefore$ $u=g^{-1}u\varphi(g) \tag{*}$.

Error says -

! Package amsmath Error: \tag not allowed here.
See the amsmath package documentation for explanation.
Type H <return> for immediate help.... 
$\therefore$ $u=g^{-1}u\varphi(g)\tag

I am using amsmath package

marked as duplicate by user13907, Ruben, Mico math-mode Apr 8 '16 at 8:32

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    Tag belongs on display math and cannot be used like you do here. Btw: please don't make proofs like this, use an environment to make the proof and add the proof headline. For example by using amsthm – daleif Feb 28 '16 at 20:36
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    @daleif Do you want to make that an answer? – Johannes_B Apr 8 '16 at 7:51
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    Also, you have asked a rather similar question before: How can I label an equation as (*) – sodd Apr 8 '16 at 7:57
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Tags belongs on display math and cannot be used like you do here (on inline math).

Btw: please don't make proofs like this, use an environment to make the proof and add the proof headline. For example by using amsthm

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