mjo-algebra: add \alg{} for the subalgebra generated by a set.

[mjotex.git] / mjo-algebra.tex

diff --git a/mjo-algebra.tex b/mjo-algebra.tex
index 4f3f79cd5dab03694d66be516bb4b157c7c1e1c9..71ba6221a1b9f0859fcbcb1530a251f7234e93af 100644 (file)
--- a/mjo-algebra.tex
+++ b/mjo-algebra.tex
@@ -9,6 +9,11 @@
   \usepackage{amsopn}
 \fi
 
+% The (sub)algebra generated by its argument, a subset of some ambient
+% algebra. By definition this is the smallest subalgebra (of the
+% ambient one) containing that set.
+\newcommand*{\alg}[1]{\operatorname{alg}\of{{#1}}}
+
 % The fraction field of its argument, an integral domain. The name
 % "Frac" was chosen here instead of "Quot" because the latter
 % corresponds to the term "quotient field," which can be mistaken in