newenvironment{isaantiq};

--- a/lib/texinputs/isabelle.sty	Thu Apr 12 13:58:47 2007 +0200
+++ b/lib/texinputs/isabelle.sty	Thu Apr 12 15:01:11 2007 +0200
@@ -31,6 +31,7 @@
 \newcommand{\isactrlesup}{\egroup\egroup\end{math}\egroup}
 \newcommand{\isactrlbold}[1]{{\bfseries\upshape\boldmath#1}}
 \newcommand{\isactrlloc}[1]{{\bfseries\upshape\boldmath#1}}
+\newenvironment{isaantiq}{{\isacharat\isacharbraceleft}}{{\isacharbraceright}}
 
 
 \newdimen\isa@parindent\newdimen\isa@parskip