List questions from natural-deduction

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modus tollens in this example

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Simple Fitch proof of De Morgan law

Published on 18 Oct 2019 - 20:03

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Formal logic proof validity

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using modus ponens to deduce $(\neg A \rightarrow \neg B) \rightarrow ((\neg A \rightarrow B) \rightarrow A)$

Published on 23 Feb 2026 - 3:00

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how to prove ⊢ P↔P using natural deduction?

Published on 24 Oct 2019 - 3:12

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(P ∧ Q) → D, is the statement true?

Published on 28 Oct 2019 - 12:11

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Formal proof by natural deduction

Published on 30 Oct 2019 - 2:00

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Isabelle/HOL: Prove one of de Morgan's laws using only rule, erule, and assumption

Published on 01 Nov 2019 - 13:42

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Prove $\models_{S_5}\square(\square P\to\square Q)\lor\square(\square Q\to \square P)$ with natural deduction

Published on 25 Mar 2026 - 14:26

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Prove using Natural Deduction in predicate logic $(\forall x\ P(x))\to Q ⊢ \exists x (P(x)\to Q)$

Published on 03 Nov 2019 - 10:05

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Sequent calculus for classical higher order predicate logic - why not?

Published on 23 Feb 2026 - 6:35

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Practical Way Of Writing Natural Deduction Proofs

Published on 17 Nov 2019 - 13:27

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Fitch Exercise 8.31 Proof

Published on 19 Nov 2019 - 0:22

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Struggling with natural deduction

Published on 21 Nov 2019 - 19:46

List Question

Natural Deduction [Propositional Logic]

modus tollens in this example

Simple Fitch proof of De Morgan law

Formal logic proof validity

using modus ponens to deduce $(\neg A \rightarrow \neg B) \rightarrow ((\neg A \rightarrow B) \rightarrow A)$

how to prove ⊢ P↔P using natural deduction?

(P ∧ Q) → D, is the statement true?

Formal proof by natural deduction

Isabelle/HOL: Prove one of de Morgan's laws using only rule, erule, and assumption

Prove $\models_{S_5}\square(\square P\to\square Q)\lor\square(\square Q\to \square P)$ with natural deduction

Prove using Natural Deduction in predicate logic $(\forall x\ P(x))\to Q ⊢ \exists x (P(x)\to Q)$

Sequent calculus for classical higher order predicate logic - why not?

Practical Way Of Writing Natural Deduction Proofs

Fitch Exercise 8.31 Proof

Struggling with natural deduction

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