Currently I have a TeX document, written using sig-alternate.cls class file. I need to change it and use llncs.cls. However, when I attempt to compile the document with the class changed, I get the following error:
! Undefined control sequence.
<recently read> \mathbb
If I comment the corresponding line, it gives an error on the next one:
! Undefined control sequence.
<recently read> \rightarrowtail
and so on, deprecating me of several mathematical symbols' usage, which seems strange to me - aren't \mathbb
and \rightarrowtail
standard keywords in TeX? And how can it be that some style file prevents me from using them? I have checked this on a simple example:
\documentclass{llncs}
\begin{document}
$\rightarrowtail$
\end{document}
This leads to an error, but when I change the documentclass
to sig-alternate.cls, everything works well. Also, if I write a simple document with llncs.cls without usage of these symbols, everything is OK too. I will be very grateful for your help. Thanks in advance.