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4)Consider the following (where a,B,y are taken to be distinct primitive propositions):

By March 4, 2022No Comments

4)Consider the following (where a,B,y are taken to be distinct primitive propositions):{aV(BA)}卡(-a)→(B台)Use the semantic tableaux method to determine whether or not the given is a semantic implicationthat holds;if it does not hold,describe every (type of)valuation for which it fails to hold.

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