Which of the following statements does not describe a valid way of adding new lines to...
Which of the following statements does not describe a valid way of adding new lines to a proof:
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Making a substitution using a logical equivalence |
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Adding the right hand side of a logical implication if the left hand side already appears in the proof |
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Forming the AND of two lines that already appear |
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Making a substitution using a logical implication |
Homework Answers
(1) Logical equivalent expression can be used to replace each other without changing its meaning. Therefore,Making a substitution using a logical equivalence is a valid way.
(2)implication (A=>B says if A then B ).Therefore ,Adding the right hand side of a logical implication if the left hand side already appears in the proof is a valid way.
(3)Forming the AND of two lines that already appear is a valid way.
(4)Making a substitution using a logical implication is not a valid way.because right hand side of implication depends on its left side.
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