[a]/[b][[.../c]]
where [a], [b], and [c] are all values
[a], [b], and [c] are numbers
returns the quotient of [a] divided by [b], and that when divided by [c], in the most precise type that appears in the chain
div(type[a], type[b], type[c]) is defined
returns a call of [a], [b], and [c] to div
[a] / [b] is defined
evaluates [a]/[b] first, then evaluates the rest of the expression