<p>Is it possible for Stack Exchange to make available $\LaTeX$ abbreviations for <code>\mathrm{E}</code>, <code>\mathrm{Var}</code>, <code>\mathrm{Cov}</code> (possibly with new commands <code>\E</code>, <code>\Var</code> and <code>\Cov</code>)? The problem is that things like $\mathrm{Var}[X\mid Y]$ look much better than $Var[X\mid Y]$, but we end up losing a lot of time typing that.</p>
