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Suppose A ≠ ∅ and A⊆ℝ. Let A = [0,2). Formally prove that sup(A) = 2...

Suppose A ≠ ∅ and A⊆ℝ. Let A = [0,2). Formally prove that sup(A) = 2 (prove 2 is an upper bound and then prove it is the lowest upper bound formally)

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