Phi 270
Fall 2013
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Homework for Philosophy 270, Fall 2013

Homework on §3.4—assigned Fri 9/27 and due Mon 9/30

(to PDF format)

Use a derivation to show the following fails to hold generally and confirm a counterexample lurking in a dead-end gap:

¬ ((A ∧ B) ∧ ¬ C), A ⊨ C