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5 cards from this section. Quick, good the night before a test.
Define a satisfiable proposition.
Think about a scenario where it is at least true.
What does it mean for a proposition to be unsatisfiable?
What if there are no conditions making it true?
What is a satisfiable proposition?
Consider cases where it can be true.
True or False: An unsatisfiable proposition can be true for some assignments.
Recall the definition of unsatisfiability.
Create an expression for the compound proposition to show that either A is true or B is true, but not both.
Think about how to combine the two propositions safely.
Given the expression (p ∧ q) ∨ (¬p ∧ r), express it in CNF.
Use logical identities to help in reformatting.
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