Fractional derivative

[robmio]

(10-29-2022 04:17 PM)Albert Chan Wrote:  

Quote:fnz:=(x)->fnz(purge(x));

What does fnz(x) do?
Recursion without a base case ... does it cause infinite recursions?

Also, why purge(x)?
It seems x is function argument, thus already local variable.

with this instruction I tried not to make the "x" variable appear in the HP Prime CasVar. In this way, however, I cannot calculate some derivatives such as "DerFraz((x)->exp(x), 23 / 100,0). Can you help me?