Question

Intuitionistic proof of $((p\rightarrow q)\rightarrow p)\rightarrow\neg \neg p$

score 75 · Answer 1 · 2026-02-23 05:14:17

75

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Intuitionistic proof of $((p\rightarrow q)\rightarrow p)\rightarrow\neg \neg p$

Published on 23 Feb 2026 - 5:14

score 90 · Answer 2 · 2026-03-25 04:18:50

90

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How to prove that a formula is intuitionistically valid using Kripke semantics?

Published on 25 Mar 2026 - 4:18

score 91 · Answer 3 · 2023-08-31 19:26:10

91

Views

Natural deduction (Proof tree)

Published on 31 Aug 2023 - 19:26

score 81 · Answer 4 · 2023-09-09 19:51:57

81

Views

Understanding the definition of $\neg \phi$, and (RAA), in Mathematical Logic by Chiswell and Hodges

Published on 09 Sep 2023 - 19:51

score 792 · Answer 5 · 2023-09-10 21:37:01

792

Views

How do I know what assumptions I can make in a proof?

Published on 10 Sep 2023 - 21:37

score 80 · Answer 6 · 2023-09-12 02:42:39

80

Views

Validity of Deductive Arguments

Published on 12 Sep 2023 - 2:42

score 76 · Answer 7 · 2023-09-14 18:55:00

76

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How To Prove This Simple Theorem Using Fitch Natural Deduction System

Published on 14 Sep 2023 - 18:55

score 119 · Answer 8 · 2023-09-16 19:49:23

119

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How do we know that the negation of a statement is unique? (Mathematical Logic by Chiswell and Hodges)

Published on 16 Sep 2023 - 19:49

score 59 · Answer 9 · 2023-09-24 06:14:27

What is the justification for the RAA rule, and how does it relate to the Principle of Explosion? (Mathematical Logic by Chiswell and Hodges)

score 202 · Answer 10 · 2023-10-07 03:07:54

202

Views

What is an example of a proof that uses the principle of explosion/ex falso quodlibet?

Published on 07 Oct 2023 - 3:07

score 384 · Answer 11 · 2023-10-13 23:51:32

384

Views

Natural Deduction Proof: (A ∨ B) ∧ (A ∨ C) ∴ A ∨ (B ∧ C)

Published on 13 Oct 2023 - 23:51

score 77 · Answer 12 · 2023-10-31 17:01:29

77

Views

Natural deduction proof unsure if correct

Published on 31 Oct 2023 - 17:01

score 117 · Answer 13 · 2023-11-17 11:37:23

117

Views

Proving ∀xFx v ∃x~Fx from no premises

Published on 17 Nov 2023 - 11:37

score 141 · Answer 14 · 2023-12-31 12:42:10

141

Views

Natural deduction - prove a theorem

Published on 31 Dec 2023 - 12:42

score 407 · Answer 15 · 2024-01-01 11:49:45

407

Views

Are there axioms in a natural deduction system?

Published on 01 Jan 2024 - 11:49

List Question

Intuitionistic proof of $((p\rightarrow q)\rightarrow p)\rightarrow\neg \neg p$

How to prove that a formula is intuitionistically valid using Kripke semantics?

Natural deduction (Proof tree)

Understanding the definition of $\neg \phi$, and (RAA), in Mathematical Logic by Chiswell and Hodges

How do I know what assumptions I can make in a proof?

Validity of Deductive Arguments

How To Prove This Simple Theorem Using Fitch Natural Deduction System

How do we know that the negation of a statement is unique? (Mathematical Logic by Chiswell and Hodges)

What is the justification for the RAA rule, and how does it relate to the Principle of Explosion? (Mathematical Logic by Chiswell and Hodges)

What is an example of a proof that uses the principle of explosion/ex falso quodlibet?

Natural Deduction Proof: (A ∨ B) ∧ (A ∨ C) ∴ A ∨ (B ∧ C)

Natural deduction proof unsure if correct

Proving ∀xFx v ∃x~Fx from no premises

Natural deduction - prove a theorem

Are there axioms in a natural deduction system?

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