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  3. let Σ ⊆ p rop(a). show that Σ|−

Let Σ ⊆ P rop(A). Show that Σ|− p iff Σ ∪ {¬p} is unsatisfifiable.

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Advance Math

Let Σ ⊆ P rop(A). Show thatΣ|− p iff Σ ∪ {¬p} isunsatisfifiable.

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