Add \unit{} for the multiplicative identity element.

[mjotex.git] / mjo-algebra.tex

diff --git a/mjo-algebra.tex b/mjo-algebra.tex
index 7ff7b5ae737ac2c14cbe4eda7af0a4f72fde2a5d..36ad4bd64888c1b2926ff2d454c989e3a561a6aa 100644 (file)
--- a/mjo-algebra.tex
+++ b/mjo-algebra.tex
@@ -12,6 +12,18 @@
 \input{mjo-common} % for \of, and \binopmany
 
 
 \input{mjo-common} % for \of, and \binopmany
 
 

+% The multiplicative identity element of its argument, which should be
+% an algebraic structure.
+\newcommand*{\unit}[1]{ 1_{{#1}} }
+
+\ifdefined\newglossaryentry
+  \newglossaryentry{unit}{
+    name={\ensuremath{\unit{R}}},
+    description={the multiplicative identity (unit) element of $R$},
+    sort=u
+  }
+\fi
+

 % The direct sum of two things.
 \newcommand*{\directsum}[2]{ {#1}\oplus{#2} }
 
 % The direct sum of two things.
 \newcommand*{\directsum}[2]{ {#1}\oplus{#2} }