The “n==0?” node is intended to be a ternary operator; its output is n*f(n-1) in the case where n is not 0 (and when n is 0, its output is hardcoded to 1).
The “n==0?” node is intended to be a ternary operator; its output is n*f(n-1) in the case where n is not 0 (and when n is 0, its output is hardcoded to 1).