On P. 74, I think the "Disjunctive Syllogisms" chart has a typo for the first of Ponendo Tollens:
Either P or Q
P
Therefore, not P
should be:
Either P or Q
P
Therefore, not Q
Page 70 has it right.
Todd
P.S. GREAT logic books! Thank you!
Either P or Q
P
Therefore, not P
should be:
Either P or Q
P
Therefore, not Q
Page 70 has it right.
Todd
P.S. GREAT logic books! Thank you!

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