List questions from natural-deduction

Published on 12 Apr 2013 - 10:10

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Proof using natural deduction

Published on 03 Jun 2013 - 18:13

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Prove that $\vdash p \lor \lnot p$ is true using natural deduction

Published on 09 Jul 2013 - 0:34

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Natural deduction proof

Published on 27 Aug 2013 - 13:22

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Optimal Solution in Natural Deduction

Published on 11 Sep 2013 - 11:48

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Natural Deduction: $(p \lor q)\to r\vdash p \to r$ and $p\to\neg q\leftrightarrow(r\lor s),\neg s\vdash (p\land \neg q)\to r$

Published on 09 Oct 2013 - 2:35

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Natural Deduction and Identity

Published on 09 Oct 2013 - 23:32

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How to prove this just by using Natural Deduction?

Published on 27 Oct 2013 - 15:19

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Need help to prove this by using natural deduction.

Published on 31 Oct 2013 - 13:11

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Natural Deduction please help!

Published on 10 Nov 2013 - 22:18

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Natural deduction proof of a simple formula.

Published on 17 Nov 2013 - 18:30

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Proof of $\exists x \exists y (\varphi(x)\rightarrow \psi(y)) \rightarrow \exists x (\varphi(x)\rightarrow \psi(x))$ in natural deduction

Published on 19 Nov 2013 - 17:27

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Natural deduction proof of $(\alpha\to\beta)\to(\beta\to\gamma)\to(\alpha\to\gamma)$

Published on 19 Nov 2013 - 17:35

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Can necessity rule be derived from box introduction rule?

Published on 27 Mar 2026 - 0:57

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The introduction rule for implication

Published on 06 Dec 2013 - 18:22

List Question

Direct cut-elimination for natural deduction.

Proof using natural deduction

Prove that $\vdash p \lor \lnot p$ is true using natural deduction

Natural deduction proof

Optimal Solution in Natural Deduction

Natural Deduction: $(p \lor q)\to r\vdash p \to r$ and $p\to\neg q\leftrightarrow(r\lor s),\neg s\vdash (p\land \neg q)\to r$

Natural Deduction and Identity

How to prove this just by using Natural Deduction?

Need help to prove this by using natural deduction.

Natural Deduction please help!

Natural deduction proof of a simple formula.

Proof of $\exists x \exists y (\varphi(x)\rightarrow \psi(y)) \rightarrow \exists x (\varphi(x)\rightarrow \psi(x))$ in natural deduction

Natural deduction proof of $(\alpha\to\beta)\to(\beta\to\gamma)\to(\alpha\to\gamma)$

Can necessity rule be derived from box introduction rule?

The introduction rule for implication

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