I have the following block of TeX:
\begin{align*}
m_n^+ = \dfrac{1}{n}\sum\limits_{k=N+1}^{n} =& \dfrac{1}{n}\sum\limits_{k=N+1}^{n}\left(a_k-L+L\right) \\
<& \dfrac{1}{n}\sum\limits_{k=N+1}^{n}\left(\dfrac{\epsilon}{2}+L\right) \\
<& \dfrac{1}{n}\sum\limits_{k=1}^{n}\left(\dfrac{\epsilon}{2}+L\right) = \dfrac{\epsilon}{2}+L \\
\end{align*}
How could I set a label for the last line in this block so that I may reference it later?
Best Answer
You can either
\tag
the line in an (unnumbered)align*
or\nonumber
each equation you don't want in a (numbered)align
. Here's a snapshot of both:The approach depends on the ease of use, or perhaps the size (number/quantity) of the set of the equations.
The former
\tag
-method uses the same counter (equation
), although it requires manually stepping. In both instances,\label
works as usual to capture the number for later use through\eqref
.