When I use the following tex syntax, the tex filter do not generate any image (i tried with texdebug.php also):
u(r) = \begin{array}{c}\infty & {r < \sigma } & {} \cr{ - \varepsilon } & {\sigma < r < \sigma } & {} \cr0 & {r > \lambda \sigma } & {} \cr\end{array}
However, when use the same syntax with mimetex.cgi of forkosh.com or in a copy of that in my server it correctly produces the image. A similar problem arises with \begin{align}....\end{align} syntax also
Please help