: 8. Prove that the following is a valid deduction rule: P→Q Q → R .. P- R : 7. Are these system specifications consistent?
: 8. Prove that the following
is a valid deduction rule:
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
being upgraded.” Show the truth table and explain for which case it is consistent or inconsistent.
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