deletions | additions       diff --git a/untitled.tex b/untitled.tex  index a427e20..a7c76f2 100644  --- a/untitled.tex  +++ b/untitled.tex 
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\begin{align}  \frac{dh_1}{dt}=\frac{u_1}{A_1}-\frac{a_1}{A_1}\sqrt{2gh_1} \\  \frac{dh_2}{dt}=\frac{a_1}{A_2}\sqrt{2gh_1}-\frac{a_2}{A_2}\sqrt{2gh_2} \\  \frac{dh_1}{dt}=\frac{a_2}{A_3}\sqrt{2gh_2}+\frac{u_2}{A_3} \frac{dh_3}{dt}=\frac{a_2}{A_3}\sqrt{2gh_2}+\frac{u_2}{A_3}  -\frac{a_3}{A_3}\sqrt{2gh_3} \\ \frac{dh_4}{dt}=\frac{a_3}{A_4}\sqrt{2gh_3} -\frac{a_4}{A_4}\sqrt{2gh_4}   \end{align} 
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