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I have four equations which I want to split, align and make sure there is a space between the equations.

\begin{align*} 
    \sum^\infty_{i=1} (3t_{2i-1}+t_{2i})9^{-i} \\
    =\sum^\infty_{i=1} (3t_{2i-1}+t_{2i})3^{-2i}\\
    = \sum^\infty_{i=1} 3^{-(2i-1)} t_{2i-1} + 3^{-2i} t_{2i}\\  
    =\sum^\infty_{i=1} t_i 3^{-i}
\end{align*}

I tried using the align environment, but it aligns to the right.

I tried using flalign but this leaves no space between the equations.

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  • You've missed a * at \end{align*}. – audiophiel Jul 16 '16 at 22:10
  • Just FYI, your question doesn't really seem to be about sharelatex itself, so I added a few more appropriate tags. the fact that you may be using sharelatex to write LaTeX is not relevant, unless your question is specifically about sharelatex itself, how to use it, or some problem you're having with the service – Au101 Jul 16 '16 at 22:53
  • @audiophiel I took the liberty of adding it – Au101 Jul 16 '16 at 22:54
  • 1
    the thing you're missing is an & which is what marks the division between the left-hand side of an equation and the right-hand side. you need to read some elementary documentation. try texdoc amsmath, for example. – barbara beeton Jul 17 '16 at 1:34
  • @Au101 how do you make edits with just one letter? is that a matter of reputation? – audiophiel Jul 17 '16 at 6:22
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Something like

\documentclass[preview]{standalone}
\usepackage{amsmath}
\begin{document}
\begin{align*} 
&\sum^\infty_{i=1} (3t_{2i-1}+t_{2i})9^{-i}&& \\
&=\sum^\infty_{i=1} (3t_{2i-1}+t_{2i})3^{-2i}\\
&= \sum^\infty_{i=1} 3^{-(2i-1)} t_{2i-1} + 3^{-2i} t_{2i}\\  
&=\sum^\infty_{i=1} t_i 3^{-i}
\end{align*}
\end{document}

should do what you want: enter image description here

You can play arround with the & signs a bit to get exactly what you want.

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I'm not sure what you mean by not leaving space between the equations, but flalign works fine; see below. Image at the top is flalign*, at the bottom it's align*.

\documentclass[preview]{standalone}
\usepackage{amsmath}
\begin{document}
\begin{flalign*} 
&\sum^\infty_{i=1} (3t_{2i-1}+t_{2i})9^{-i}&\\
&=\sum^\infty_{i=1} (3t_{2i-1}+t_{2i})3^{-2i}&\\
&= \sum^\infty_{i=1} 3^{-(2i-1)} t_{2i-1} + 3^{-2i} t_{2i}&\\  
&=\sum^\infty_{i=1} t_i 3^{-i}
\end{flalign*}
\begin{align*} 
&\sum^\infty_{i=1} (3t_{2i-1}+t_{2i})9^{-i}\\
&=\sum^\infty_{i=1} (3t_{2i-1}+t_{2i})3^{-2i}\\
&= \sum^\infty_{i=1} 3^{-(2i-1)} t_{2i-1} + 3^{-2i} t_{2i}\\  
&=\sum^\infty_{i=1} t_i 3^{-i}
\end{align*}
\end{document}

enter image description here

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