[Tugindia] derivative at a point

[Herbert Voss]

Baburaj A. Puthenveettil schrieb:
> 	
> 	I need to write dt 
>                         ---| 
>                         dz |
> 			   |y=0
> 

\[
\left.\frac{\partial t }{\partial z }\right|_{y=0}
\]


Herbert