My favourite is:
Does the exponential function have a square root?
I will give a comprehensive answer as soon as I got the time.
edit: Oh I see its similar to:
What’s a natural candidate for an analytic function that interpolates the tower function?
Where some people from our forum gave some hints already.
Does the exponential function have a square root?
I will give a comprehensive answer as soon as I got the time.
edit: Oh I see its similar to:
What’s a natural candidate for an analytic function that interpolates the tower function?
Where some people from our forum gave some hints already.