[Request] for renaming variables

[CR Haeger]

It was suggested to me earlier to use Function.F1:=f versus just F1:=f. This seems to allow the definition of F1 even if the FUNCTION app is not ACTIVE.

I use this and f(x):= frequently enough that I created USER keys for both of them - to save keystrokes.

I usually use Function.F2:=f' to define F2 as the first derivative of f.