It is proved that: (n - > infinity) limn ^ (1 / N) = 1

It is proved that: (n - > infinity) limn ^ (1 / N) = 1

Order a_ n = n^(1/n)-1>=0
Then when n > 1, n = (1 + a)_ n)^n = 1+n*a_ n+n(n-1)/2*a_ n^2+...+a_ n^n < 1+n(n-1)/2*a_ n^2
So 0 0, that is n ^ (1 / N) - > 1