Construct a Formal Proof of validity: (Ǝx) Ux ⊃ (y)[(Uy v Vy) ⊃ Wy] (Ǝx) Ux • (Ǝx) Wx ∴(Ǝx) (Ux • Wx)

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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Construct a Formal Proof of validity:

(Ǝx) Ux ⊃ (y)[(Uy v Vy) ⊃ Wy]

(Ǝx) Ux • (Ǝx) Wx

∴(Ǝx) (Ux • Wx)

 

I. 1. 1. (x)(Ax Ɔ Bx)
2. (x)(Bx Cx)
1.. (x)(Bx ɔ Cx) Ɔ (Ak ɔ Ck)
3. Ak
4. Ak ɔ Bk
1, UI
5. ВК
4, 3, M.P.
6. Bk Ɔ Ck
7. Ck
2, UI
6, 5, M.P.
S. Ak Ɔ Ck
3-7, C.P.
9. (x)(Bx Cx) (Ak Ɔ Ck) 2-8, C.P.
2-8, С.Р.
Transcribed Image Text:I. 1. 1. (x)(Ax Ɔ Bx) 2. (x)(Bx Cx) 1.. (x)(Bx ɔ Cx) Ɔ (Ak ɔ Ck) 3. Ak 4. Ak ɔ Bk 1, UI 5. ВК 4, 3, M.P. 6. Bk Ɔ Ck 7. Ck 2, UI 6, 5, M.P. S. Ak Ɔ Ck 3-7, C.P. 9. (x)(Bx Cx) (Ak Ɔ Ck) 2-8, C.P. 2-8, С.Р.
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