lyx: Can not use AMS math.

[Shaul Karl <shaulk@israsrv.net.il>]

Package: lyx
Version: 1.1.2-2
Severity: normal


Although I have activated the radio button of AMS math at the Layout->Document 
menu I can not been able to follow what the UserGuide.lyx suggets.
In particular, both \mathfrak{g} and \mathbb{R} give an error message.
\boldsymbol{\alpha}, which does not seem to require the AMS extentions is 
working as expected.
Can you advise what is the problem?


-- System Information
Debian Release: potato
Kernel Version: Linux rakefet 2.2.13 #1 Sat Nov 20 12:44:19 EST 1999 i586 
unknown

Versions of the packages lyx depends on:
ii  libc6           2.1.2-10       GNU C Library: Shared libraries and timezone
ii  libforms0.89    0.89-4         The XForms graphical interface widget librar
ii  libstdc++2.10   2.95.2-4       The GNU stdc++ library
ii  xlib6g          3.3.5-2        shared libraries required by X clients
ii  xpm4g           3.4k-5         the X PixMap library
        ^^^ (Provides virtual package libxpm4)