#snippet dmo "\DeclareMathOperator"
#    \\DeclareMathOperator{${1}}{${2}}

#snippet $$ "$Math$"
#    \$${1:VISUAL}\$

#snippet em "\emph{...}"
#    \emph{${1:VISUAL}}

#snippet \ "\[ ... \]"
#    \[
#        ${1}
#    \]