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Use a truth table to show that 3 q P→ "P is not a tautology. (This example shows that substitution isn't valid for inference rules, in general. Substituting the weaker statement, q, for the stronger statement, p, in the expression "p" doesn't work.) pq →9 P (P→ a) ^ "P ((P→ a) ^ "p) →q ?v ?✓ PEEE PEER T FT ? ? FF ? 24 2 ?~

Use a truth table to show that 3 q P→ "P is not a tautology. (This example shows that substitution isn't valid for inference rules, in general. Substituting the weaker statement, q, for the stronger statement, p, in the expression "p" doesn't work.) pq →9 P (P→ a) ^ "P ((P→ a) ^ "p) →q ?v ?✓ PEEE PEER T FT ? ? FF ? 24 2 ?~

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Use a truth table to show that p+g} = is not a tautology. (This example shows that substitution isn't valid for inference rules, in general. Substituting the weaker statement, q, for the stronger statement, p, in the expression "p" doesn't work.) ((p →g) ^¯p) → ¬9 P 9 → a "P (p →q) ^¯p T T?v ? ✓ ?✓ ?✓ TF ? ?V ? ✓ FT ?v ?✓ FF ?v ?✓ 79 **** ?v ? ¬q ? ✓ |2v| ?v ? ✓
Transcribed Image Text:Use a truth table to show that p+g} = is not a tautology. (This example shows that substitution isn't valid for inference rules, in general. Substituting the weaker statement, q, for the stronger statement, p, in the expression "p" doesn't work.) ((p →g) ^¯p) → ¬9 P 9 → a "P (p →q) ^¯p T T?v ? ✓ ?✓ ?✓ TF ? ?V ? ✓ FT ?v ?✓ FF ?v ?✓ 79 **** ?v ? ¬q ? ✓ |2v| ?v ? ✓
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