For which primes p does the series $\sum_{i=0}^\infty (\frac{10}{11})^i$ converge p-adically

93 Views Asked by At

For which primes p does the series $\sum_{i=0}^\infty (\frac{10}{11})^i$ converge p-adically and, when it does, to what limit?

1

There are 1 best solutions below

7
On

Hint: $p$-adic analysis is a doll when infinite series is involved since a series converges iff its general term's sequence converges to zero, so the question is:

$$\left(\frac{10}{11}\right)^n\stackrel ?{\xrightarrow[n\to\infty]{}0}\;\;p-\text{adically}$$