R Markdown similar feature to "newcommand" in LaTex? : <p>Does R Markdown have a similar construct to LaTex's "newcommand"? I would like to be able to define things like <code>\var</code> to be <code>\mathrm{Var}</code> to avoid the extra typing in math mode. If not, what do people do to reduce repetition in typesetting equations in markdown?</p>
