let-a-n-x-n-with-radius-of-convergence-R-prove-that-R-1-lim-n-sup-n-a-n-

Question Number 37355 by math khazana by abdo last updated on 12/Jun/18

l e t Σ a_{n} x^{n} w i t h r a d i u s o f c o n v e r g e n c e R

p r o v e t h a t R = \frac{1}{{l i m}_{n \to + \infty} {s u p}^{n} \sqrt{∣ a_{n} ∣}} .