Just want to be sure, so you believe that "operation" can be changed with "function" (which I agree with), but not always vice-versa, right? If so, could you explain why it doesn't work the other way around?
ah, okay ... I get what you're saying ... an operation is a particular type of function that is of the mentioned form .
Um, sorry for kinda dragging this out, but if that is indeed the case, why do we sometimes distinguish some operations to be operations (addition, multiplication, etc.), whilst other times, we don't make this distinction (in particular, the floor FUNCTION is an operation, but we call it function instead of operation)?
I'm sure there are other named functions out are called functions, but can also be considered to be operations ... why is that? (basically same question as above) ... that's what I'm really curious about ... is there a particular "rule/idea" for which operations can be named operations?