Question

1. For each of the following Σ ⊆ Prop(A), decide whether or not Σ is consistent....

1. For each of the following Σ ⊆ Prop(A), decide whether or not Σ is consistent.

(a) Σ = {p, q, ¬(p ∨ q)}

(b) Σ = {p ∨ ¬q, ¬(p ∨ q)}

(c) Σ = {p ∨ ¬q, ¬(p ∨ q), p → q}

(d) Σ = {¬(p ∨ q), ¬q ∨ r,(q ∨ r) → s}

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