Cauchy-Hadamard theorem
= Cauchy-Hadamard theorem
{c}
{wiki=Cauchy–Hadamard_theorem}
For $\sum a_nz^n$,
$$
\frac1R=\limsup_{n\to\infty}|a_n|^{1/n},
$$
with the usual conventions for zero and infinity.
= Cauchy-Hadamard theorem
{c}
{wiki=Cauchy–Hadamard_theorem}
For $\sum a_nz^n$,
$$
\frac1R=\limsup_{n\to\infty}|a_n|^{1/n},
$$
with the usual conventions for zero and infinity.