Unformatted text preview: (Hint: see p. 75 of the textbook.) (5) Find, if they exist, the supremum (least upper bound) and inﬁmum (greatest lower bound) of the following subsets of R . (a) { 1 , 2 , 3 } . (b) (0 , 1) ∪ { 2 } ∪ [3 , 4) = { x ∈ R : 0 < x < 1 or x = 2 or 3 ≤ x < 4 } . (c) { 11 n : n ∈ N } . (d) Q . (6) Prove Theorem 2.3.2 in the textbook. 1...
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 '08
 PROTSAK
 Natural Numbers, #, Rational number

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