How to add some spaces progressively in a multiple line equation using align environment?

Question

Hope you are doing fine. Now, to get straight to the point: I have a multiple line equation inside an align environment. I have been trying, with no success, to accommodate each line inside the equation so that the final product can be an equation showing a slight inclination...

Minimal working example below:

\documentclass[a4paper,12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{booktabs}
\usepackage{array} 
\usepackage{fullpage}
\usepackage{graphicx}
\usepackage{fancyhdr}
\begin{document}
\begin{align}
\begin{aligned}
\gamma_i\,\gamma_j\,\gamma_k\ \tilde{M}_{jk} &= const_{\alpha}\,{\Big[}\gamma_1\gamma_1\gamma_1\,m_{11} \,+\\ 
 & + \gamma_1\gamma_1\gamma_2\,m_{12} \\ 
 & + \gamma_1\gamma_1\gamma_3\,m_{13} \\
 & + \gamma_1\gamma_2\gamma_1\,m_{21} \\
 & + \gamma_1\gamma_2\gamma_2\,m_{22} \label{someequation}\\ 
 & + \gamma_1\gamma_2\gamma_3\,m_{23} \\ 
 & + \gamma_1\gamma_3\gamma_1\,m_{31} \\ 
 & + \gamma_1\gamma_3\gamma_2\,m_{32} \\ 
 & + \gamma_1\gamma_3\gamma_3\,m_{33}{\Big]}. 
\end{aligned}
\end{align}
\end{document}

I have tried with \qquad, shifting the & around, removing it, \hspace, {}, and many other options, with no success. Is there any chance this can be done with some elegancy (or not)?

Thanks in advance! Cheers

unrelated but \mathrm{const} and don't use align for single line equations, use equation — David Carlisle, Mar 08 '21 at 22:21
Ultimately, this question is asking how to insert horizontal space, which is a duplicate of What commands are there for horizontal spacing? — Werner, Mar 08 '21 at 22:33
Thanks @Mico! for the greetings and David Carlisle for the \mathrm tip and the align issue. — GEBRU, Mar 09 '21 at 00:19

score 5 · Accepted Answer · answered Mar 08 '21 at 22:29

something like this perhaps

\documentclass[a4paper,12pt]{article}
% only in old latex \usepackage[utf8]{inputenc}
\usepackage{amsmath}
\newcommand\z[1]{\hspace{#1em}}
\begin{document}
\begin{equation}\label{someequation}
\gamma_i\,\gamma_j\,\gamma_k\ \tilde{M}_{jk} = \operatorname{const}_{\alpha}\Bigl[
\begin{aligned}[t]
 & \gamma_1\gamma_1\gamma_1\,m_{11} \\ 
 &\z1 + \gamma_1\gamma_1\gamma_2\,m_{12} \\ 
 &\z2 + \gamma_1\gamma_1\gamma_3\,m_{13} \\
 &\z3 + \gamma_1\gamma_2\gamma_1\,m_{21} \\
 &\z4 + \gamma_1\gamma_2\gamma_2\,m_{22} \\ 
 &\z5 + \gamma_1\gamma_2\gamma_3\,m_{23} \\ 
 &\z6 + \gamma_1\gamma_3\gamma_1\,m_{31} \\ 
 &\z7 + \gamma_1\gamma_3\gamma_2\,m_{32} \\ 
 &\z8 + \gamma_1\gamma_3\gamma_3\,m_{33} \smash{\Bigr]}
\end{aligned}
\end{equation}
\end{document}

the thing of using \equation environment instead of align, as I see, is that it sets the equation number in the first line, and not in the middle of the equation, rigth?. How can I fix that?. Thanks in advance! — GEBRU, Mar 09 '21 at 00:38

score 4 · Answer 2 · answered Mar 08 '21 at 22:30

Something like this?

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath} % for 'aligned' environment
\begin{document}
\begin{equation} \label{someequation}
\begin{aligned}
\gamma_i\,\gamma_j\,\gamma_k\ \widetilde{M}_{jk} = \mathrm{const}_{\alpha}\, 
 & \bigl[\gamma_1\gamma_1\gamma_1\,m_{11} + {}\\ 
 & \mkern0mu  + \gamma_1\gamma_1\gamma_2\,m_{12} \\ 
 & \mkern2mu  + \gamma_1\gamma_1\gamma_3\,m_{13} \\
 & \mkern4mu  + \gamma_1\gamma_2\gamma_1\,m_{21} \\
 & \mkern6mu  + \gamma_1\gamma_2\gamma_2\,m_{22} \\ 
 & \mkern8mu  + \gamma_1\gamma_2\gamma_3\,m_{23} \\ 
 & \mkern10mu + \gamma_1\gamma_3\gamma_1\,m_{31} \\ 
 & \mkern12mu + \gamma_1\gamma_3\gamma_2\,m_{32} \\ 
 & \mkern14mu + \gamma_1\gamma_3\gamma_3\,m_{33} \bigr]. 
\end{aligned}
\end{equation}
\end{document}

Thank you very much @Mico This is also a solution!. – GEBRU Mar 09 '21 at 00:15 — GEBRU, Mar 09 '21 at 00:15

How to add some spaces progressively in a multiple line equation using align environment?

2 Answers2