[Haskell-beginners] Simple function comparison

[Stephen Renehan]

Hi,

I'm looking to do a comparison between 2 simple functions to see if
they are equivalent but I appear to be running into some problems if
anyone can help.

The two functions I want to compare are f (g a) and g (f a).

I have f defined and g defined as
 f :: a -> a
 f = undefined

g :: a -> a.
g =  undefined

The compiler was complaining about the type signature lacking a
binding so added undefined to get around the error. I understand that
I must be missing something very basic as they look incomparable in
this form. Any suggestions of what changes I should make such a
comparison practical?

Many thanks,

Stephen

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