Pure Recursive Functions

Q: Normally, when creating a recursive function, I use the name of the function to perform the recursive call.

However, this has the disadvantage that the symbol fact is now global. Is it possible to create a pure recursive function?

A: Andrzej Kozlowski (akoz@mimuw.edu.pl) writes: #0 is a rarely used “parameter,” which refers to the pure function itself and thus makes it possible to create pure recursive functions.