List questions from natural-deduction

Published on 26 Feb 2015 - 8:39

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Proving $\vdash (p\to q)\lor (q\to r)$ using natural deduction

Published on 26 Mar 2026 - 6:13

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RAA elimination and inference a theory ?!

Published on 01 Apr 2015 - 15:24

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prove P ∧ Q → P ⇔ R ∨ ¬R in natural deduction

Published on 09 Apr 2015 - 18:23

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What sequent does this derivation prove?

Published on 25 Apr 2015 - 3:08

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Proving $ \neg ( \neg \alpha \wedge \neg \neg \alpha )$

Published on 26 Apr 2015 - 1:01

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I'm wodering if this statement is provable in logic $ \lnot \alpha \to \lnot \lnot \lnot \alpha ) $

Published on 30 Apr 2015 - 3:10

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Name of this rule: $a \vdash b$ and $b \vdash c$ then $a \vdash c$?

Published on 02 May 2015 - 7:37

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Question regarding using the natural deduction system

Published on 10 May 2015 - 14:20

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Intuitionistic Logic: introduction and elimination rules for the universal and existential quantifiers

Published on 26 Mar 2026 - 6:10

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Natural deduction proof: {A → B, B → (C & D), ¬C v ¬D} ⊢ ¬A

Published on 21 May 2015 - 21:28

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Prove that the following argument is valid

Published on 21 May 2015 - 22:09

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A Natural-Deduction proof of $ \{ \neg N,\neg N \to L,D \leftrightarrow \neg N \} \vdash (L \lor A) \land D $.

Published on 21 May 2015 - 23:21

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Prove that the set of sentences $\{A \land (B \lor C), (\lnot C \lor H) \land (H \rightarrow \lnot H), \lnot B\}$ is inconsistent

Published on 22 May 2015 - 0:02

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Rule T in First-Order Logic

Published on 22 May 2015 - 15:48

List Question

Proving De Morgan's Law with Natural Deduction

Proving $\vdash (p\to q)\lor (q\to r)$ using natural deduction

RAA elimination and inference a theory ?!

prove P ∧ Q → P ⇔ R ∨ ¬R in natural deduction

What sequent does this derivation prove?

Proving $ \neg ( \neg \alpha \wedge \neg \neg \alpha )$

I'm wodering if this statement is provable in logic $ \lnot \alpha \to \lnot \lnot \lnot \alpha ) $

Name of this rule: $a \vdash b$ and $b \vdash c$ then $a \vdash c$?

Question regarding using the natural deduction system

Intuitionistic Logic: introduction and elimination rules for the universal and existential quantifiers

Natural deduction proof: {A → B, B → (C & D), ¬C v ¬D} ⊢ ¬A

Prove that the following argument is valid

A Natural-Deduction proof of $ \{ \neg N,\neg N \to L,D \leftrightarrow \neg N \} \vdash (L \lor A) \land D $.

Prove that the set of sentences $\{A \land (B \lor C), (\lnot C \lor H) \land (H \rightarrow \lnot H), \lnot B\}$ is inconsistent

Rule T in First-Order Logic

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