Prove. {a_n} converges, then it is Cauchy.
I think I already got the answer. Can someone let me know if I'm allowed to start like this.
|a_n - L|< e for n>N, and
|a_m - L|< e for m>N
|a_n - a_m| = |(a_n - L) - (a_m - L)|...
Prove. {a_n} converges, then it is Cauchy.
I think I already got the answer. Can someone let me know if I'm allowed to start like this.
|a_n - L|< e for n>N, and
|a_m - L|< e for m>N
|a_n - a_m| = |(a_n - L) - (a_m - L)|...