Discuss the given sequence

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Question: Observe that the sequence 12, 15, 8, 13, 7, 18, 19, 11, 14, 10 has three increasing subsequences of length four: 12, 15, 18, 19; 12, 13, 18, 19; and 8, 13, 18, 19. It also has one decreasing subsequence of length four: 15, 13, 11, 10. Show that in any sequence of n2 + 1 distinct real numbers, there must be a sequence of length n + 1 that is either strictly increasing or strictly decreasing.

Reference no: EM131573875

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