- #1
vrbke1007kkr
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Homework Statement
Assume all sn =/= 0, and that the limit L = lim|(sn+1)/(sn)| exist.
a) Show that if L<1 then lim sn = 0
b) Show that if L>1 then lim sn = + oo
Homework Equations
There is a hint that we should select 'a' s.t. L<a<1 and obtain N s.t. n>N => |sn+1 < a|sn|.
Then show that |sn| < an-N|sN|
The Attempt at a Solution
Its easy to get: |sn+1|< ([tex]\epsilon+L[/tex])|sn|, now I tried using the fact that L<1 to find an epsilon and an 'a' such that |sn+1|< a|sn|
Even if I find such a, and even if I can prove |sn| < an-N|sN|, how do I get that |sn| < [tex]\epsilon[/tex] for all epsilon