A sequence X xn in R is said to convert to x R or x is said
     A sequence X = (x_n) in R is said to convert to x  R. or x is said to to be a limit of (x_n), if for every  > 0 there exists a natural number K  N such that for all n greaterthanorequalto K, the terms x_n satisfy |x_n - x|  0 there exists a natural number K  N such that for all n > K, the terms x_n satisfy |x_n - x|  0 there exists a natural number K  N such that for all n > K, the terms x_n satisfy |x_n - x|  0, for every natural number K  N, there exists n  N such that n > K and the terms x_n satisfy |x_n - x|  0, there exists a natural number K  N such that for all n greaterthanorequalto K, the terms x_n satisfy |x_n - x|  0, for all n  N, the terms x_n satisfy |x_n - x|  
  
  Solution
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4. the proof an be stated in such a way that : If I give you an epsilon> 0, you have to
 come up with an N that “works.” Also note that xn tends to x as n tends to infinity means the
 same thing as mod(xn  x) tends to 0 as n tends to infinity.

