Many of the "math functions" on the cited page are, in fact, binary. For example: Plus
, Times
, Power
, Log
(unary or binary), Mod
, ....
In fact, for either theoretical or practical purposes, I don't understand what the importance would be for knowing which built-in functions are unary, binary, ternary, or whatever.
In that comment, I'm comparing the situation with the programming language J (https://www.jsoftware.com/), where each primitive is either unary or binary and it essential to know which are which.