Mathematics, 31.07.2019 21:30 himatasy
Outline a natural deduction proof that formalizes the conditional intro-duction and conditional elimination steps of the proof of lemma 3 below.
lemma 1.if x is a real number, then x−1 is a real number.
lemma 2. if y is a real number, then 0≤y2 .
lemma 3. if z is a real number, then2z≤z2+ 1.
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Outline a natural deduction proof that formalizes the conditional intro-duction and conditional elim...
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