How do I prove the following statements: (a) For all a, b, c ∈ Z, if a < b, then a + c < b + c. (b) For all integers a, b, if 0 < a and a < b, then a^2 a. ● (O2) For all a, b ∈ Z, if 0 < a and 0 < b, then 0 < a + b. ● (O3) For all a, b ∈ Z, if 0 < a and 0 < b, then 0 < a ⋅ b. ● (O4) for all a, b ∈ Z, a < b exactly when 0 < b − a.
How do I prove the following statements: (a) For all a, b, c ∈ Z, if a < b, then a + c < b + c. (b) For all integers a, b, if 0 < a and a < b, then a^2 a. ● (O2) For all a, b ∈ Z, if 0 < a and 0 < b, then 0 < a + b. ● (O3) For all a, b ∈ Z, if 0 < a and 0 < b, then 0 < a ⋅ b. ● (O4) for all a, b ∈ Z, a < b exactly when 0 < b − a.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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How do I prove the following statements:
(a) For all a, b, c ∈ Z, if a < b, then a + c < b + c.
(b) For all integers a, b, if 0 < a and a < b, then a^2<b^2
(c) 0 < 1
Using these rules:
● (O1) If a ∈ Z, then exactly one of the following is true: 0 < a, a = 0, 0 > a.
● (O2) For all a, b ∈ Z, if 0 < a and 0 < b, then 0 < a + b.
● (O3) For all a, b ∈ Z, if 0 < a and 0 < b, then 0 < a ⋅ b.
● (O4) for all a, b ∈ Z, a < b exactly when 0 < b − a.
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