Math & Science ⇒ Aligning specific Arrays of Equations

[KarolisK]

Hello!
My name is Karolis and I am very glad to have joined LaTeX community. As I started using LaTeX just yesterday, I have encountered copious amounts of errors. However, almost all of them I have solved, except for one particular problem with the alignment. I want to align specific blocks or single equations to the left, while leaving others aligned to the center. I have seen in the previous posts how to align all the equations to the left by adding [fleqn] in \documentclass entry.

Code: Select all

\documentclass[a4paper]{article}
\usepackage{amsmath}
\begin{document}
Sum?:\newline
I want to sum be aligned with letter $I$ at the start of this sentence:
	\begin{align*}
	\sum_j
	\end{align*}
\begin{flushleft}
The next equation should appear in the center:
\end{flushleft}
\begin{equation}
\omega=0
\end{equation}
\end{document}

After scrolling through some other posts, seems like it can be done by inserting \setlength{\mathindent}{0} at some environment, however i noticed it does not work if you do not use [fleqn], which automatically aligns all the equations(including the ones I want to be centered) to the left.

[Stefan Kottwitz]

Hi Karolis,

welcome to the board!

It's very good that you posted a compilable minimal example, so it's easy to test and to make working suggestions.

You can use a flalign environment and force left alignment by two &:

Code: Select all

\begin{flalign*}
  \sum_j &&
\end{flalign*}

Stefan

[KarolisK]

Thank you for the help, works perfectly!