1. Simplify the assertion ¬ ∃d ∈ D, (d ∈ E) & (d < f)& ∀e ∈ D, (d ∈ E) ⇒ (d = e)
2. Give a two-column proof of the following deduction: b ∈ D ∪E, ∴ (b /∈ D) ⇒ (b ∈ E
3. Give a two-column proof of the following deduction: (x ∈ A) ⇒(x ∈ B), ∴ (x ∈ C B) ⇐⇒ (x ∈ (C A) B)
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