Hi Michal,
thanks for your fast reply.
My project is very huge, because I'm using the same latex source for dynamic help (tex4ht) and printing (pdflatex). My latex preamble loads many many packages, but I have no problems except that in some formulas. It seems to happen in the formulas that make use of the cases environment.
I also tried to use:      \left{   \begin{array} ... \end{array} \right.
but the problem is the same.
However, there are cases where the "cases" environment does not give me problems.
Regards.
-j




Il 10/02/2015 16:21, Michal Hoftich ha scritto:
Hi Giuseppe,

could you please post minimal working example which produces the
error? When I tried

-----
\documentclass{article}
\begin{document}
\[
k_v=\min\begin{cases}
  1  \\
\frac{k_{n}(1+\frac{1,1i^{1,5}}{\sqrt{h}})}{\sqrt{h}(\sqrt{\alpha(1-\alpha)}+0,8\frac{x}{h}\sqrt{\frac{1}{\alpha}-\alpha^{2}})}
\\
\end{cases}
\]
\end{document}

the output was correct. So maybe the problem is with some package you use.

Regards,
Michal

2015-02-10 12:39 GMT+01:00 Giuseppe Pica <[email protected]>:
Hi,
the following latex code produces a black stripe as shown in figure.

\[
k_v=\min\begin{cases}
  1  \\
\frac{k_{n}(1+\frac{1,1i^{1,5}}{\sqrt{h}})}{\sqrt{h}(\sqrt{\alpha(1-\alpha)}+0,8\frac{x}{h}\sqrt{\frac{1}{\alpha}-\alpha^{2}})}
\\
\end{cases}
\]

http://www.iperspace.it/main121x.png

How can I fix this?
Thanks in advance.
Regards
-j

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