List questions from natural-deduction

Published on 05 Sep 2020 - 4:14

107

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Proving and disproving First Order Logic statements in $\mathbb{N}$.

Published on 06 Sep 2020 - 14:37

538

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Does sequent calculus have axiom?

Published on 23 Feb 2026 - 18:40

312

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Do inference rules mean the same in a Hilbert system and in a natural deductive system?

Published on 23 Feb 2026 - 10:16

161

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Logic justification for the use of "Let $y = ...$" in Existential proof.

Published on 11 Sep 2020 - 20:46

58

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Natural Deduction Proof with Many Assumptions

Published on 12 Sep 2020 - 15:06

95

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Natural Deduction Proof with Mistake

Published on 12 Sep 2020 - 17:28

263

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Natural Deduction Proof without Logical Equivalences

Published on 29 Mar 2026 - 2:34

70

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Perform a Natural Deduction with No Logical Equivalencies

Published on 13 Sep 2020 - 16:26

369

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Natural Deduction $(\phi \wedge \psi) \to \chi \vdash (\phi \to \chi) \vee (\psi \to \chi)$

Published on 29 Mar 2026 - 3:02

564

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Natural Deduction Proof With Quantifiers

Published on 19 Sep 2020 - 3:46

166

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Natural Deduction Proof with Quantifiers Proof Validation

Published on 19 Sep 2020 - 18:34

860

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Predicate Logic - Natural deduction

Published on 21 Sep 2020 - 19:24

91

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Swapping implications - I have no idea where to begin with this

Published on 22 Sep 2020 - 19:44

81

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Prove $(s \to p) \to (s \to q)$ using propositional logic

Published on 24 Sep 2020 - 21:31

List Question

How to derive ~(P → Q) → P?

Proving and disproving First Order Logic statements in $\mathbb{N}$.

Does sequent calculus have axiom?

Do inference rules mean the same in a Hilbert system and in a natural deductive system?

Logic justification for the use of "Let $y = ...$" in Existential proof.

Natural Deduction Proof with Many Assumptions

Natural Deduction Proof with Mistake

Natural Deduction Proof without Logical Equivalences

Perform a Natural Deduction with No Logical Equivalencies

Natural Deduction $(\phi \wedge \psi) \to \chi \vdash (\phi \to \chi) \vee (\psi \to \chi)$

Natural Deduction Proof With Quantifiers

Natural Deduction Proof with Quantifiers Proof Validation

Predicate Logic - Natural deduction

Swapping implications - I have no idea where to begin with this

Prove $(s \to p) \to (s \to q)$ using propositional logic

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