If $tau_1$, ..., $tau_n$ are numbers, then the term {tt (/ $tau_1 ... tau_n$)} denotes the result $tau$ obtained by
dividing the number denoted by $tau_1$ by the numbers denoted by $tau_2$ through $tau_n$. An exception occurs when $n=1$, in which case the term denotes the reciprocal $tau$ of the number denoted by $tau_1$.
(Undefined (Arity /))