User blog comment:Nedherman1/New Notation Idea/@comment-35470197-20180713222712/@comment-35470197-20180714015536

So what is the value of \(f_1(0)\), and which rule do you use to compute it? Could you substitute \(a=1\) to \(f_a(0)\)?

The use of such alphabets is ok. I just smiled when I imagined \(f_n(n)\), where \(n\) is the alphabet :D