# Align multiple equations centering

I am trying to center multiple equations with align, gather, and center but could have done yet. How can I do it? The picture shows what I want. Thank you

\documentclass{article}

\usepackage{amssymb,amsmath}

\begin{document}

$$\Delta l_{x}|_{x=l_x} = 0.001l_x \Delta l_{x}|_{x=0} = \Delta l_{y}|_{y=l_y} = \Delta l_{y}|_{y=0} = \Delta l_{z}|_{z=z} = \Delta l_{z}|_{z=0} =0$$

\end{document}

Use gathered or gather depending whether you want a shared equation number

\documentclass{article}

\usepackage{amssymb,amsmath}

\begin{document}

equation
$$\begin{gathered} \Delta l_{x}|_{x=l_x} = 0.001l_x \\ \Delta l_{x}|_{x=0} = \Delta l_{y}|_{y=l_y} = \Delta l_{y}|_{y=0} = \Delta l_{z}|_{z=z} = \Delta l_{z}|_{z=0} =0 \end{gathered}$$

gather
\begin{gather}
\Delta l_{x}|_{x=l_x} = 0.001l_x \\
\Delta l_{x}|_{x=0} = \Delta l_{y}|_{y=l_y} = \Delta l_{y}|_{y=0} = \Delta l_{z}|_{z=z} = \Delta l_{z}|_{z=0} =0
\end{gather}

\end{document}
• You should also suggest reading the user guide (texdoc amsldoc). It's not all that long. Commented Jun 22, 2022 at 22:57
• Thank you so much David. I will check the guide. Have a nice day. Commented Jun 23, 2022 at 7:19