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Possible Duplicate:
Blank lines in align environment

When I put a blank line between a line of text and the align environment, it will add two blank lines instead. It seems that the align environment automatically adds a set of blank lines. I don't want two sets of blank lines, but this makes my code very hard to read. Compare (the 'correct way')

\begin{align*}
L\frac{di}{dt} + Ri = EU(t) \\
i(0) = 0
\end{align*}
In Heaviside's operator notation, this is 
\begin{align*}
pLi + Ri &= EU(t)\\
i &= \frac{E}{pL + R}U(t)
\end{align*}

and

\begin{align*}
L\frac{di}{dt} + Ri = EU(t) \\
i(0) = 0
\end{align*}

In Heaviside's operator notation, this is 

\begin{align*}
pLi + Ri &= EU(t)\\
i &= \frac{E}{pL + R}U(t)
\end{align*}

This may seem trivial but in a large document it's really hard to read the first example and relatively easy to read the second.

Is there a way to change this, e.g. with a \renewcommand?

By the way, is there an easier way of putting code on this site besides hitting space bar 4 times for each line? I tried HTML tags but they don't work.

marked as duplicate by Marco Daniel, Alan Munn, lockstep, Stefan Kottwitz Nov 26 '11 at 20:50

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  • 2
    For readability of your source file, you can simply put a comment character (%) to separate the lines in your first example. For highlighting code in tex.sx posts, you can select all the code and then click on the {} icon. – Alan Munn Nov 26 '11 at 20:28
  • The blank line tells TeX to start a new paragraph; the behaviour you are seeing is to be expected. You are not seeing two blank lines, but are seeing a paragraph skip. – cmhughes Nov 26 '11 at 20:38
7

Use the comment sign % instead of a blank line.

\begin{align*}
L\frac{di}{dt} + Ri = EU(t) \\
i(0) = 0
\end{align*}
%
In Heaviside's operator notation, this is 
%
\begin{align*}
pLi + Ri &= EU(t)\\
i &= \frac{E}{pL + R}U(t)
\end{align*}

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