2

I try to reproduce the output that is generated by:

\begin{equation}
    \begin{aligned}
    (x-x_1)^2 + (y-y_1)^2 & = r_1^2 \\
    (x-x_2)^2 + (y-y_2)^2 & = r_2^2 \\
    (x-x_3)^2 + (y-y_3)^2 & = r_3^2 \\
    \end{aligned}
    \label{label a}
\end{equation}
Additional lines:
\begin{equation}
    \begin{aligned}
    (x-x_k)^2 + (y-y_k)^2 & = r_k^2     
    \end{aligned}
    \label{label b}
\end{equation}

but make the two aligned blocks use the same alignment (as if it was just one align block. I tried to do this with just one align block + intertext for the line of text in the middle. But this gave me 4 lines of equation with 4 individual numbers which is not desired.

Thanks for your help and sorry for my bad english.

3

Like this?

\documentclass{article}
\usepackage{mathtools}
\begin{document}
  \begin{align}
    (x-x_1)^2 + (y-y_1)^2 & = r_1^2 \notag\\
    (x-x_2)^2 + (y-y_2)^2 & = r_2^2     \label{label a}\\
    (x-x_3)^2 + (y-y_3)^2 & = r_3^2 \notag
\shortintertext{Additional lines:}
    (x-x_k)^2 + (y-y_k)^2 & = r_k^2
    \label{label b}
\end{align}
\end{document}

enter image description here

\shortintertext is from mathtools package and gives a tighter spacing than \intertext.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.