# [Tugindia] derivative at a point

David Kastrup David.Kastrup at t-online.de
Sun Jun 15 15:03:07 CEST 2003

"Baburaj A. Puthenveettil" <apbabu at mecheng.iisc.ernet.in> writes:

> Hi,
> 	Sorry, if this is too trivial for the list, but I couldnt find
> anything easy for this
>
> 	I need to write dt
>                         ---|
>                         dz |
> 			   |y=0
>
> I tried \frac{\partial t }{\partial z }\arrowvert_{y=0} and
> ....._{\arrowvert_{z=0}}
>
> in both cases I do not get exactly what I would like to see. How do I make
> the vertical line cover the full height(or the bottom 3/4th) of the
> fraction, with y=0 as subscript slightly below the dz? is there some std
> math symbol that acheives this?

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

Of you could just write something like \Bigr|_{y=0} or one of the
other size commands (\biggr \Biggr).

--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
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