$`\require{color} % Using
\newcommand{\NN}[1]{ \textcolor{orange}{\text{#1}} } % New Name
\newcommand{\NX}[1]{ \textcolor{orange}{#1} } % New EXpression
`$
$`\text{volatile namespace}\\
\text{we define function }\NN{f1}\\
\quad \text{by positon}\\
\qquad \text{for }x, y :\in {\bf R}\\
\quad \text{returns type }{\bf R}\\
\text{applying standard-expression}\\
\quad x^2 + y^2\\
\text{end}
`$
$`\text{we define function }\NN{f2}\\
\quad \text{by name}\\
\qquad \text{for }x, y :\in {\bf R}\\
\quad \text{returns type }{\bf R}\\
\text{applying standard-expression}\\
\quad x^2 + y^2\\
\text{end}\\
\text{end namespace}
`$
