1stMidInfo012510

1stMidInfo012510 - 1 FIRST MIDTERM INFORMATION TEST GIVEN...

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1 FIRST MIDTERM INFORMATION TEST GIVEN 1/25/10 1. A tautology is a statement form which is true under any truth assignment to its variables. A contradiction is a statement form which is false under any truth assignment to its variables. Two statement forms are logically equivalent if and only if they have the same truth values under any truth assignment to the variables that appear. The most common scores for this problem were 8 and 10. The most common error is to not mention variables or truth assignments. 2. Straightforward construction of truth table. Some people made an error in the truth table and answered "neither". I gave 0 for that. If you answered correctly, but I spotted a defect in the truth table, then there was a few points taken off. 3. Same comments as 2. A few points taken off for not clearly identifying the critical rows. 4. ( x Z)(~x < x). ( x Z)(x > 1 x > 0). ( x
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1stMidInfo012510 - 1 FIRST MIDTERM INFORMATION TEST GIVEN...

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