Is there a difference between writing f(x), g(x), h(x)? Do the letters f, g, h, etc. have any significance?

1 Answer
Jun 14, 2016

No. They have no special significance.

Explanation:

All of these are simply used by convention to refer to a function. For example, f(x)=ex, a(x)=ex, and z(x)=ex all mean the same thing.

However, some notations mean only one thing. For example, ζ(s) refers to the Riemann zeta function:
n=11ns
(See this link for more info: Riemann zeta function)

In general, though, functions that describe one particular equation (like the Riemann zeta function) use Greek letters instead of normal English characters.

And the variable z generally refers to multi-variable functions, such as z=xy.

I'm sure others can add more to this question, so I invite further answers/comments.