2.3.12 Prove Lemma 2.3.10 (2). Only need to prove #2 0f Lemma 2.3.10. Lemma 2.3.10. Let a E R. 1. a <0 if and only if a < ɛ for all ɛ > 0 2. a 2 0 if and omly if a > -e for all ɛ > 0 3. a = 0 if and omly if Ja| < ɛ for all ɛ > 0.
2.3.12 Prove Lemma 2.3.10 (2). Only need to prove #2 0f Lemma 2.3.10. Lemma 2.3.10. Let a E R. 1. a <0 if and only if a < ɛ for all ɛ > 0 2. a 2 0 if and omly if a > -e for all ɛ > 0 3. a = 0 if and omly if Ja| < ɛ for all ɛ > 0.
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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2.3.12
Please include reasons for each step.
From The Real Numbers and
https://muhammadalfaridzi.files.wordpress.com/2014/05/the_real_numbers_and_real_analysis.pdf

Transcribed Image Text:### Section 2.3.12
**Task**: Prove Lemma 2.3.10 (2). Only need to prove #2 of Lemma 2.3.10.
---
### Lemma 2.3.10
Let \( a \in \mathbb{R} \).
1. \( a \leq 0 \) if and only if \( a < \varepsilon \) for all \( \varepsilon > 0 \)
2. \( a \geq 0 \) if and only if \( a > -\varepsilon \) for all \( \varepsilon > 0 \)
3. \( a = 0 \) if and only if \( |a| < \varepsilon \) for all \( \varepsilon > 0 \)
---
This lemma involves proving inequalities for real numbers using limits and comparisons with small positive numbers \( \varepsilon \). The goal is to demonstrate the truth of these inequalities under the specified conditions.
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