Proof: Monotone Sequence has Monotone Subsequences | Real Analysis

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We prove if a sequence is monotone then all of its subsequences are monotone. In particular, we prove that all subsequences of an increasing sequence are increasing and all subsequences of a decreasing sequence are decreasing. We prove this using the definition of a monotone sequence. #RealAnalysis

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It' really well explained, thank you but I'm not clear about at 4:37 how can we say that a_n_k > a_n_k + 1 ? Don't we need to write it as a_n_k > a_n_k -1 > a_n_k - 2 > ... > a_n_k+1 ?

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