Consider the claim: (*) “Some porcupines are quadrupeds”.What is the converse of (*)?What is the obverse of (*)?What is the contrapositive of (*)?If all we know is that (*) is true, what do we know about the truth-values of (*)’s converse, obverse and contrapositive?Now suppose all we know is that (*) is false. (Assume an Aristotelian interpretation of categorical claims.)What do we know about the truth-value (i.e. true or false) of the corresponding A claim?What do we know about the truth-value of the corresponding O claim?What do we know about the truth-value of the corresponding E claim?
Some porcupines are quadrupeds
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