Let (sn) be a sequence that converges (a) Show that (c) Conclude that if all but finitely many sn belong to [a, b], then limsn ∈ [a, b] Then supposing that lim
(sn) be a sequence, let s be a number, and suppose that sn −s ≤ an for all n ≥ 1, where (an) is a sequence with limit 0 Then limn sn = s Proof: We have 0
Suppose n1 < n2 < n3 < ··· is a strictly increasing sequence of indices, then (snk ) is a subsequence of (sn) We will Now we state some limit theorems Let (sn) be a sequence that converges to s ∈ R Applying the definition to ε = 1, we see
(b) Suppose (sn) and (tn) are sequences such that sn ≤ tn for all n and lim tn = 0 (c) lim[ √ 4n2 + n − 2n] = 1 4 8 9 Let (sn) be a sequence that converges
15 juil 2013 · Solution Let sn = n Suppose (sn) is a convergent sequence such that lim sn < 23 Let us prove that if ∑ sn converges, then so does ∑ sp
7 Let (sn) be a convergent sequence and suppose that lim sn > a Prove that there exists a number N such that n>N
8 5a) Claim: Suppose that (an), (bn) and (sn) are three sequences and that Now, suppose that (sn) converges to 0 Let ϵ > 0 Since limsn = 0, there exists N
Let (sn) be a bounded decreasing sequence Then (−sn) is a bounded increasing sequence, so −sn → L for some limit L Hence (sn) is convergent with sn
Theorem 2 3 If (sn) converges, then its limit is unique Proof Suppose s and t are two limits Take c = s−t 2 in the definition of limit Then ∃N1, N2 such that
For the inductive step, suppose we have defined b1, ,bn and bn = rl = ak Let { an} be a bounded sequence such that every convergent subsequence of {an} n + 1 This is an example of a telescoping series Since ∞ lim n=1 sn = ∞ lim