Question

discuss supremum and infimum of a set and distinguish them from greatest and the least point of set

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Answer 2

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The supremum of a set is its least upper bound and the infimum is its greatest upper bound. Definition 2.2. Suppose that A ⊂ R is a set of real numbers. If M ∈ R is an upper bound of A such that M ≤ M′ for every upper bound M′ of A, then M is called the supremum of A, denoted M = sup A.

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