Show that
![\frac{ \partial ^{2} z}{ \partial x ^{2} } - {\frac{ \partial z}{ \partial y} = 0 \frac{ \partial ^{2} z}{ \partial x ^{2} } - {\frac{ \partial z}{ \partial y} = 0](https://tex.z-dn.net/?f=+%5Cfrac%7B+%5Cpartial+%5E%7B2%7D+z%7D%7B+%5Cpartial++x+%5E%7B2%7D+%7D+-+%7B%5Cfrac%7B+%5Cpartial++z%7D%7B+%5Cpartial+y%7D+%3D+0+)
is parabolic
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whit tiny shining objects
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