# -*- mode: snippet -*-
# name: sum
# key: sum
# --
\sum\limits${1:$(when (> (length yas-text) 0) "_")
}${1:$(when (> (length yas-text) 1) "{")
}${1:i=0}${1:$(when (> (length yas-text) 1) "}")
}${2:$(when (> (length yas-text) 0) "^")
}${2:$(when (> (length yas-text) 1) "{")
}${2:n}${2:$(when (> (length yas-text) 1) "}")} $0