A1. In each of the questions below identify the statement that does not hold in a complete ordered field K and provide a counterexample. (a) (i) Va, b e K, 3cEK, c> a+b. (ii) Va, b = K, [a

Algebra & Trigonometry with Analytic Geometry
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Chapter3: Functions And Graphs
Section3.2: Graphs Of Equations
Problem 23E
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A1. In each of the questions below identify the statement that does not hold in a complete
ordered field K and provide a counterexample.
(a) (i) Va, b ≤ K, c € K, c> a+b.
(ii) Va, b = K, [a < b ⇒ a² < b²] .
(iii) Va, b = K, [a<b⇒ a +1≤ b + 1].
(b) (i) Va, b, c ≤ K, [(a ≤ b) V (b < c) ⇒ (a < c)].
(ii) a € K, Vb € K, ab = b.
(iii) Va, b ≤ K, (0 <a<b⇒ 0<b−¹ < a¯¹).
(c) (i) Va, b ≤ K, (a ≤ b) V (b ≤ a).
(ii) Va, b, c € K, (ab)c = a(bc).
(iii) 3b € K, Va € K, a + b = 1.
(d) (i) Va € K, 3b € K, a + b = 1.
(ii) Va € K, 3b € K, ab = 1.
(iii) every non-empty set that is bounded above has a least upper bound.
Transcribed Image Text:A1. In each of the questions below identify the statement that does not hold in a complete ordered field K and provide a counterexample. (a) (i) Va, b ≤ K, c € K, c> a+b. (ii) Va, b = K, [a < b ⇒ a² < b²] . (iii) Va, b = K, [a<b⇒ a +1≤ b + 1]. (b) (i) Va, b, c ≤ K, [(a ≤ b) V (b < c) ⇒ (a < c)]. (ii) a € K, Vb € K, ab = b. (iii) Va, b ≤ K, (0 <a<b⇒ 0<b−¹ < a¯¹). (c) (i) Va, b ≤ K, (a ≤ b) V (b ≤ a). (ii) Va, b, c € K, (ab)c = a(bc). (iii) 3b € K, Va € K, a + b = 1. (d) (i) Va € K, 3b € K, a + b = 1. (ii) Va € K, 3b € K, ab = 1. (iii) every non-empty set that is bounded above has a least upper bound.
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