How to tag an equation?

Question

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

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
Also, you have asked a rather similar question before: How can I label an equation as (*) — sodd, Apr 08 '16 at 07:57

score 2 · Answer 1 · answered Apr 08 '16 at 08:03

2

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

answered Apr 08 '16 at 08:03

daleif

54,450

How to tag an equation?

1 Answers1