deletions | additions       diff --git a/begin_equation_1_begin_align__.tex b/begin_equation_1_begin_align__.tex  deleted file mode 100644  index 69babc0..0000000  --- a/begin_equation_1_begin_align__.tex  +++ /dev/null 
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\begin{equation}  (1)\;  \begin{align*}  \frac{\partial}{\partial y}: \;  \frac{\partial u}{\partial t}   \to  \frac{\partial}{\partial y} \left( \frac{\partial u}{\partial t}\right)   &= \frac{\partial}{\partial y}\left[ \frac{\partial}{\partial t} \left( -\frac{\partial \zeta}{\partial y} \right) \right]   = - \frac{\partial^2 \zeta}{\partial y^2} \\  %newline  \frac{\partial}{\partial x}: \;  \frac{\partial v}{\partial t}  \to   \frac{\partial}{\partial x} \left( \frac{\partial v}{\partial t}\right)   &= \frac{\partial}{\partial x}\left[ \frac{\partial}{\partial t} \left( \frac{\partial \zeta}{\partial x} \right) \right]   = \frac{\partial^2 \zeta}{\partial x^2}  \end{align*}  \end{equation}