How can I reference to the equations in the alignat? The equation set is

 \sigma_1 &= x + y  &\quad \sigma_2 &= \frac{x}{y} \\  
 \sigma_1' &= \frac{\partial x + y}{\partial x} & \sigma_2'
    &= \frac{\partial \frac{x}{y}}{\partial x}

Now in my text I want to refer like this

As you can see, \ref{equation1} is above \ref{equation2}!
  • 3
    Add a unique \label{} to each line of the equation. – Steven B. Segletes Dec 20 '14 at 19:35
  • qnd you may want to use \eqref instead of just \ref. – barbara beeton Dec 20 '14 at 20:11

We would use \label{labelname} on a line (before the \\ command) to label a particular line. It is conventional to use the \eqref command in order to automatically wrap the reference with parentheses.



\sigma_1 &= x + y  &\quad \sigma_2 &= \frac{x}{y} \label{equation1}\\  
\sigma_1' &= \frac{\partial x + y}{\partial x} & \sigma_2'
     &= \frac{\partial \frac{x}{y}}{\partial x} \label{equation2}

As you can see, \eqref{equation1} is above \eqref{equation2}!

Since labels are not 'typed', it is also conventional to precede the label by eq: in order to indicate the label is an equation label. For example, we would use \label{eq:equation1} and \eqref{eq:equation1} or something to that effect.

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