Sunday, June 2, 2019

Blanshard on Implication and Necessity #5

This post is less about what Blanshard says in his book than the earlier ones and my last in this series.

Blanshard's critique is excellent. Still, I wonder why he did not say something like: Why are two of the rows in the truth table, when p is F in post #1, even relevant? To wit, what logical truth is implied by '7 < 4' or 'the moon is made of cheese'?

Subsequent to the problems with "material implication" logic being noticed and acknowledged, relevance logic arose. It was proposed before Blanshard’s book was first published in 1939. However, it didn’t become prominent until the 1970s.

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