Is there such an $f$ smooth function and $x\in D_f$, so that the sequence $f(x), f'(x), f''(x), ...$ grows faster than exponential?
Can it grow at a factorial rate or faster?
Is there such an $f$ smooth function and $x\in D_f$, so that the sequence $f(x), f'(x), f''(x), ...$ grows faster than exponential?
Can it grow at a factorial rate or faster?
For a single point $x$, it can be arranged that $f^{(n)}(x)=d_n$ for an arbitrary sequence $d_n$.