Problem 5: Let the sequence {x_n}_{n=1}^infty ? ? be such that lim_{k??} x_{2k} = A ? lim_{k??} x_{2k-1} = B, A, B ? ? ? {+?, -?}. Prove that the set S of subsequential limits of {x_n}_{n=1}^infty is S = {A, B}. (5 points)
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Step 1: We are given that the subsequential limits of the even terms of the sequence are A and the subsequential limits of the odd terms of the sequence are B. Show more…
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Problem 5: Let the sequence {x_n}_{n=1}^infty ⊂ ℑ be such that lim_{k→∞} x_{2k} = A ∧ lim_{k→∞} x_{2k-1} = B, A, B ∈ ℑ ∪ {+∞, -∞}. Prove that the set S of subsequential limits of {x_n}_{n=1}^infty is S = {A, B}. (5 points)
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5. (3 pts.) For each sequence, find the set S of subsequential limits, the limsup and the liminf. Here it suffices to give the answer, no justification is required. (a) a_n = (n^2+1)/(2n^2-1) S = lim sup a_n = lim inf a_n = (b) a_n = sin n S = lim sup a_n = lim inf a_n = (c) cos(nπ/4) S = lim sup a_n = lim inf a_n =
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