>>>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.

On the lighter side. Here is the definition of recursion.
Recursion: See recursion.