Question: True or False. State the correctness of each statement. You may want to use the de nitions of entailment on p . 2 1 4

True or False. State the correctness of each statement. You may want to use the de nitions of entailment on p.214 and 222 of the book. = i in every model is which is true, is also true. For any sentences and ,= i () is valid.

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