>>>>>Sure, you can call a function from within that function. How that must be done with the above equation is your endeavour. :)
>>>>
>>>>Recursion isn't just a function calling a function. It is a function calling a very special function, namely itself.
>>>
>>>Understood. But isn't that exactly what I said? ...you can call a function from within that function...
>>
>>Not really, but we might just be splitting hair.
>>you can call a function from within that function
>>It is not just a function.
>>
>>I am sure you know exactly what recursion means and all this is just semantics.
>
>I think it would have been semantically incorrect if I had written: you can call the function from within that function. Maybe the native English speakers can comment on this one? :)

To be really clear, you'd probably want to write:

You can call a function from within the function itself.

But I think your original was clear in context. (You have to know what "that function" refers to, and in some contexts, it'll actually be something else.)

Tamar