+${\tt x}\in\fam\bbfam R$
+
+The set{\settextsize{11}text}size macro does not strew spaces.
+
+{\tt Typewriter {\it italic} {\sl slanted.}}
+
+\hd{Algorithms}
+
+\algo{Factorial}\algalias{calculate a~factorial}
+\algin A~non-negative integer~$n$
+\:If $n\ge 1$: \cmt{Test if something}
+\::Return $n$
+\:Else:
+\::Return $n \cdot \alg{Factorial}(n-1)$
+\algout The factorial of~$n$
+\endalgo