4. Write negations of following quantified statements: (a) VxeR, if |x>5 then x<-5 vx>5 (b) 3a,beZ, a|b ^ b|a
4. Write negations of following quantified statements: (a) VxeR, if |x>5 then x<-5 vx>5 (b) 3a,beZ, a|b ^ b|a
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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
Transcribed Image Text:**4. Write negations of the following quantified statements:**
(a) \(\forall x \in \mathbb{R}, \text{ if } |x| > 5 \text{ then } x < -5 \lor x > 5\)
(b) \(\exists a, b \in \mathbb{Z}, \, a | b \land b | a\)
**Explanation:**
- **Statement (a)** involves universal quantification over real numbers (\(\mathbb{R}\)). It states that for all real numbers \(x\), if the absolute value of \(x\) is greater than 5, then \(x\) is either less than -5 or greater than 5.
- **Statement (b)** involves existential quantification over integers (\(\mathbb{Z}\)). It states that there exist integers \(a\) and \(b\) such that \(a\) divides \(b\) and \(b\) divides \(a\).
The task is to find the negations of these statements, which involve logical and set theoretic transformations.
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