snippet beg "begin{} / end{}" bA
\begin{$1}
$0
\end{$1}
endsnippet

snippet mk "Math" wA
$${1}$ $0
endsnippet
snippet dm "Math" iA
\[
	${1:${VISUAL}}
.\] $0
endsnippet

snippet // "Fraction" iA
\\frac{$1}{$2}$0
endsnippet

snippet fun "Function" wA
f: \R \to \R
endsnippet
snippet sum "Sum" wA
\sum_{n=1}^{${1:\infty}} $0
endsnippet
snippet !> "Maps to" wA
\mapsto
endsnippet
snippet -> "To" wA
\to
endsnippet