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Question 9 Find the flaw in the following "proof" of this wff. (V)(³x)Q(x, y) → (3x) (Vy)Q(x, y) 1. (V)(³x)Q(x, y) hyp 2. (3x)Q(x, y) 1 ui 3. Q(a, y) 4. (vy)Q(a, y) 5. (3x)(V)Q(x, y) 2 ei 12pt ✓ Paragraph 3 ug 4 eg Edit View Insert Format Tools Table BIUA > T² V

Question 9 Find the flaw in the following "proof" of this wff. (V)(³x)Q(x, y) → (3x) (Vy)Q(x, y) 1. (V)(³x)Q(x, y) hyp 2. (3x)Q(x, y) 1 ui 3. Q(a, y) 4. (vy)Q(a, y) 5. (3x)(V)Q(x, y) 2 ei 12pt ✓ Paragraph 3 ug 4 eg Edit View Insert Format Tools Table BIUA > T² V

Advanced Engineering Mathematics
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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Question 9 Find the flaw in the following "proof" of this wff. (V)(³x)Q(x, y) → (³x) (Vy)Q(x, y) 1. (V)(³x)Q(x, y) hyp 2. (3x)Q(x, y) 3. Q(a, y) 4. (vy)Q(a, y) 5. (3x)(V)Q(x, y) 1 ui 12pt ✓ Paragraph 2 ei 3 ug 4 eg Edit View Insert Format Tools Table BIU Al > > 7 :
Transcribed Image Text:Question 9 Find the flaw in the following "proof" of this wff. (V)(³x)Q(x, y) → (³x) (Vy)Q(x, y) 1. (V)(³x)Q(x, y) hyp 2. (3x)Q(x, y) 3. Q(a, y) 4. (vy)Q(a, y) 5. (3x)(V)Q(x, y) 1 ui 12pt ✓ Paragraph 2 ei 3 ug 4 eg Edit View Insert Format Tools Table BIU Al > > 7 :
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