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Actually, (A implies B) does imply (!B implies !A). It's the contrapositive. For example, from Wikipedia, "All birds are animals" does imply "All non-animals
by ddlatham 16y ago
Actually, (A implies B) does imply (!B implies !A). It's the contrapositive.
For example, from Wikipedia, "All birds are animals" does imply "All non-animals are non-birds".
http://en.wikipedia.org/wiki/Contraposition http://en.wikipedia.org/wiki/Contraposition
- StavrosK 16y agoApparently he meant "(A implies B) does not imply (B implies A)". Affirming the consequent and all that.