--- a/preamble.tex	Tue Jul 08 21:52:06 2008 +0000
+++ b/preamble.tex	Wed Jul 09 00:10:29 2008 +0000
@@ -106,7 +106,7 @@
 \newcommand{\Complex}{\mathbb C}
 \newcommand{\Field}{\mathbb F}
 
-\newcommand{\Id}{\boldsymbol{1}}
+\newcommand{\id}{\boldsymbol{1}}
 \renewcommand{\imath}{\mathfrak{i}}
 \renewcommand{\jmath}{\mathfrak{j}}
 
@@ -119,7 +119,8 @@
 \newcommand{\iso}{\cong}
 \newcommand{\htpy}{\simeq}
 \newcommand{\actsOn}{\circlearrowright}
-\newcommand{\isoto}{\xrightarrow{\iso}}
+\newcommand{\xto}[1]{\xrightarrow{#1}}
+\newcommand{\isoto}{\xto{\iso}}
 \newcommand{\quismto}{\xrightarrow[\text{q.i.}]{\iso}}
 \newcommand{\htpyto}{\xrightarrow[\text{htpy}]{\htpy}}