List questions from natural-deduction

Published on 07 Mar 2017 - 1:07

412

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Proving the following deduction

Published on 13 Mar 2017 - 11:22

93

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Prove $A\implies C \vee D$ from $(A\implies C) \vee (A\implies D)$ with natural deduction

Published on 13 Mar 2017 - 20:23

502

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What is the relationship between the BHK interpretation of propositional logic and Natural Deduction?

Published on 25 Mar 2026 - 19:05

730

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Understanding Hilbert's program

Published on 15 Mar 2017 - 8:34

176

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How is variable substitution taken into account in natural deduction?

Published on 15 Mar 2017 - 11:49

398

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How to prove this arguments in natural deduction

Published on 18 Mar 2017 - 16:51

95

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Can someone please help with this natural deduction proof?

Published on 18 Mar 2017 - 18:27

339

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Proving that $\neg\forall x\neg G(a,x) \vdash\exists xG(a,x)$

Published on 18 Mar 2017 - 18:50

58

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Possible flaw in proof that ∃xG(a,x) ⊨ ∀xG(a,x)

Published on 19 Mar 2017 - 10:29

776

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Using natural deduction to prove P ∧ ¬Q ∧ (R → S), ¬(P → S) ⊢ R → Q

Published on 21 Mar 2017 - 4:42

132

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Beginner natural deduction, proof verification

Published on 25 Mar 2017 - 3:39

58

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Are any results known on the combinatorics of proof theory?

Published on 28 Mar 2017 - 13:32

101

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Show $\alpha \leftrightarrow \psi$ is a tautology if and only if $\alpha \approx \psi$

Published on 02 Apr 2017 - 10:20

138

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Deductive proof for the unicorn scenario

Published on 03 Apr 2017 - 17:53

List Question

"Modus moron" rule of inference?

Proving the following deduction

Prove $A\implies C \vee D$ from $(A\implies C) \vee (A\implies D)$ with natural deduction

What is the relationship between the BHK interpretation of propositional logic and Natural Deduction?

Understanding Hilbert's program

How is variable substitution taken into account in natural deduction?

How to prove this arguments in natural deduction

Can someone please help with this natural deduction proof?

Proving that $\neg\forall x\neg G(a,x) \vdash\exists xG(a,x)$

Possible flaw in proof that ∃xG(a,x) ⊨ ∀xG(a,x)

Using natural deduction to prove P ∧ ¬Q ∧ (R → S), ¬(P → S) ⊢ R → Q

Beginner natural deduction, proof verification

Are any results known on the combinatorics of proof theory?

Show $\alpha \leftrightarrow \psi$ is a tautology if and only if $\alpha \approx \psi$

Deductive proof for the unicorn scenario

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