I'm using the environment align
of the package amsmath
to display multiple lines of equations. I also use the \intertext
command of the same environment to add text between the lines of equations. Now when I use the \intertext
command in the last line of the align
environment, it adds an empty line of equation. Do you know a simple way prevent this empty line to appear? If I use the \text
command instead of \intertext
, the indentation of the added text changes. So another way of solving the problem maybe to force the command text to print left aligned text in the same way the intertext command does.
Here is my code:
\begin{align*}
\frac{F_1}{m_1} \leq \frac{F_{12}}{m_{12}} \leq \frac{F_2}{m_2}\\
\intertext{Assuming additivity of mass and that joining the two bodies doesn't affect the force acting on each body (force is additive):}
\frac{F_1}{m_1} \leq \frac{F_1+F_2}{m_1+m_2} \leq \frac{F_2}{m_2}\\
\intertext{which is true iff:}
\frac{F_1}{F_2} \leq \frac{m_1}{m_2}\\
\intertext{which is equivalent to:}
a_1 \leq a_2\\
\intertext{which is always true by hypothesis (the same demonstration applies for $a_2 \leq a_1$)}
\end{align*}
Best Answer
The last line should not belong in the
align
.On the other hand, I see no reason for forcing alignment of those equations and I'd typeset them as follows.