Phi 270 Fall 2013 |
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2.4.x. Exercise questions
Use the basic system of derivations along with the attachment rule Adj to establish the following. These repeat entailments from earlier exercises and examples (specifically, b and d of exercise 2.2.x.2 and exercises 2 and 4 of 2.3.x). They will work best as exercises in the use of Adj if you avoid using Cnj.
1. | A ⊨ A ∧ A |
2. | A ∧ B, B ∧ C, C ∧ D ⊨ A ∧ D |
3. | A ∧ B ⊨ A ∧ (B ∧ A) |
4. | A, B ∧ C, D ⊨ (C ∧ (B ∧ A)) ∧ B |
The exercise machine doesn’t incorporate attachment rules, so, while it can generate exercises where Adj would be useful, that rule won’t be used in any answers it produces.