Propositional Logic Worksheet
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21Propositional Logic
Definition: A proposition or statement is a sentence which is
either true or false.
Definition:If a proposition is true, then we say its truth value is
true, and if a proposition is false, we say its truth value is false.
Are these propositions?
1. The sun is shining.
2. The sum of two prime numbers is even.
3. 3+4=7
4. It rained in Austin, TX, on October 30, 1999.
5. x+y > 10
6. Is it raining?
7. Come to class!
8. n is a prime number.
9. The moon is made of green cheese.
Definition: A propositional variable represents an arbitrary
proposition. We represent propositional variables with uppercase let-
ters.
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