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8. Prove that the following is a valid deduction rule: P →Q Q → R

8. Prove that the following is a valid deduction rule: P →Q Q → R

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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8. Prove that the following is a valid deduction rule: P→Q Q → R .. P- R
Transcribed Image Text:8. Prove that the following is a valid deduction rule: P→Q Q → R .. P- R
7. Are these system specifications consistent? "Whenever the system software is being upgraded, users cannot access the file system. If users can access the file system, then they can save new files. If users cannot save new files, then the system software is not [4] being upgraded." Show the truth table and explain for which case it is consistent or inconsistent.
Transcribed Image Text:7. Are these system specifications consistent? "Whenever the system software is being upgraded, users cannot access the file system. If users can access the file system, then they can save new files. If users cannot save new files, then the system software is not [4] being upgraded." Show the truth table and explain for which case it is consistent or inconsistent.
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