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I have an issue when I try to align different "align" environments. This is my Latex code :

\documentclass[10pt, a4paper]{article} \usepackage[english]{babel} \usepackage[english]{isodate} \usepackage[T1]{fontenc} \usepackage[hidelinks]{hyperref} \usepackage[utf8]{inputenc} \usepackage{mathtools} \usepackage{amsmath} \usepackage{amssymb} \begin{document} \section{Example} \subsection*{Degree 1} \begin{align*} C_1' & = C_1 \\ C_0' & = a_k + C_0 \end{align*} \subsection*{Degree 2} \begin{align*} C_2' & = C_2 \\ C_1' & = 2 C_2 a_k + C_1 \\ C_0' & = C_2 a_k^2 + C_1 a_k + C_0 \end{align*} \subsection*{Degree 3} \begin{align*} C_3' & = C_3 \\ C_2' & = 3 C_3 a_k + C_2 \\ C_1' & = 3 C_3 a_k^2 + 2 C_2 a_k + C_1 \\ C_0' & = C_3 a_k^3 + C_2 a_k^2 + C_1 a_k + C_0 \end{align*} \subsection*{Degree 4} \begin{align*} C_4' & = C_4 \\ C_3' & = 4 C_4 a_k + C_3 \\ C_2' & = 6 C_4 a_k^2 + 3 C_3 a_k + C_2 \\ C_1' & = 4 C_4 a_k^3 + 3 C_3 a_k^2 + 2 C_2 a_k + C_1 \\ C_0' & = C_4 a_k^4 + C_3 a_k^3 + C_2 a_k^2 + C_1 a_k + C_0 \end{align*} \subsection*{Degree 5} \begin{align*} C_5' & = C_5 \\ C_4' & = 5 C_5 a_k + C_4 \\ C_3' & = 10 C_5 a_k^2 + 4 C_4 a_k + C_3 \\ C_2' & = 10 C_5 a_k^3 + 6 C_4 a_k^2 + 3 C_3 a_k + C_2 \\ C_1' & = 5 C_5 a_k^4 + 4 C_4 a_k^3 + 3 C_3 a_k^2 + 2 C_2 a_k + C_1 \\ C_0' & = C_5 a_k^5 + C_4 a_k^4 + C_3 a_k^3 + C_2 a_k^2 + C_1 a_k + C_0 \end{align*} \end{document}

And this is the output :

enter image description here

As you can see, equations are not well aligned. I want to align their left side on the same line but by keeping them in the middle of the page (is this clear ?)

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With \intertext:

enter image description here

\documentclass[10pt, a4paper]{article} \usepackage[english]{babel} \usepackage[english]{isodate} \usepackage[T1]{fontenc} \usepackage[hidelinks]{hyperref} \usepackage[utf8]{inputenc} \usepackage{mathtools} \usepackage{amsmath} \usepackage{amssymb} \begin{document} \section{Example} \subsection*{Degree 1} \begin{align*} C_1' & = C_1 \\ C_0' & = a_k + C_0 % \intertext{\subsection*{Degree 2}} C_2' & = C_2 \\ C_1' & = 2 C_2 a_k + C_1 \\ C_0' & = C_2 a_k^2 + C_1 a_k + C_0 % \intertext{\subsection*{Degree 3}} C_3' & = C_3 \\ C_2' & = 3 C_3 a_k + C_2 \\ C_1' & = 3 C_3 a_k^2 + 2 C_2 a_k + C_1 \\ C_0' & = C_3 a_k^3 + C_2 a_k^2 + C_1 a_k + C_0 % \intertext{\subsection*{Degree 4}} C_4' & = C_4 \\ C_3' & = 4 C_4 a_k + C_3 \\ C_2' & = 6 C_4 a_k^2 + 3 C_3 a_k + C_2 \\ C_1' & = 4 C_4 a_k^3 + 3 C_3 a_k^2 + 2 C_2 a_k + C_1 \\ C_0' & = C_4 a_k^4 + C_3 a_k^3 + C_2 a_k^2 + C_1 a_k + C_0 % \intertext{\subsection*{Degree 5}} C_5' & = C_5 \\ C_4' & = 5 C_5 a_k + C_4 \\ C_3' & = 10 C_5 a_k^2 + 4 C_4 a_k + C_3 \\ C_2' & = 10 C_5 a_k^3 + 6 C_4 a_k^2 + 3 C_3 a_k + C_2 \\ C_1' & = 5 C_5 a_k^4 + 4 C_4 a_k^3 + 3 C_3 a_k^2 + 2 C_2 a_k + C_1 \\ C_0' & = C_5 a_k^5 + C_4 a_k^4 + C_3 a_k^3 + C_2 a_k^2 + C_1 a_k + C_0 \end{align*} \end{document}
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    @graille: You're welcome. If you want to, you could also define your own command ro avoid cepeatedly typing Degree and to avoid manual numbering. Commented Aug 17, 2019 at 13:07

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