List questions from natural-deduction

Published on 12 Sep 2019 - 19:16

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Natural deduction Proof [(p →r) ∨ (q→r)]

Published on 15 Sep 2019 - 23:06

125

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Inference in natural deduction proofs: $(p \to q) \to r \vdash p \to (q \to r).$

Published on 17 Sep 2019 - 20:08

127

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Natural Deduction Proof of $p∧(q∨r) \vdash (p \land q) \lor (p \land r)$

Published on 18 Sep 2019 - 21:02

197

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Construct Natural Deduction proofs

Published on 23 Sep 2019 - 16:56

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Natural Deduction Prove ∀x¬P (x)

Published on 25 Sep 2019 - 13:42

195

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Relation between classical implication and intuitionistic implication

Published on 23 Feb 2026 - 6:33

733

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What is the difference between 'true' and 'correct'?

Published on 23 Feb 2026 - 6:34

40

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Prove a must be true if b is not for premise either a or b but not both!

Published on 30 Sep 2019 - 9:24

4.7k

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Prove P∧(Q∨R)→(P∧Q)∨(P∧R) from P∧(Q∨R) using Natural Deduction

Published on 23 Mar 2014 - 10:49

4.2k

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Natural Deduction Tautology

Published on 29 Apr 2014 - 23:51

515

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Natural Deductions of Propositional Logic and Predicate Logic

Published on 01 May 2014 - 5:00

1.1k

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Logic Proof with Natural Deduction: if I assume the antecedent, do I still have to prove the consequent?

Published on 03 May 2014 - 21:03

1k

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Law of excluded middle. Do we need it in proofs?

Published on 13 May 2014 - 18:22

417

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Natural Deduction

Published on 19 May 2014 - 20:01

List Question

How can I eliminate two conflicting subformulas in two premises in a formal proof?

Natural deduction Proof [(p →r) ∨ (q→r)]

Inference in natural deduction proofs: $(p \to q) \to r \vdash p \to (q \to r).$

Natural Deduction Proof of $p∧(q∨r) \vdash (p \land q) \lor (p \land r)$

Construct Natural Deduction proofs

Natural Deduction Prove ∀x¬P (x)

Relation between classical implication and intuitionistic implication

What is the difference between 'true' and 'correct'?

Prove a must be true if b is not for premise either a or b but not both!

Prove P∧(Q∨R)→(P∧Q)∨(P∧R) from P∧(Q∨R) using Natural Deduction

Natural Deduction Tautology

Natural Deductions of Propositional Logic and Predicate Logic

Logic Proof with Natural Deduction: if I assume the antecedent, do I still have to prove the consequent?

Law of excluded middle. Do we need it in proofs?

Natural Deduction

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