Question

Derivation of null-quantified implication.

score 182 · Answer 1 · 2018-01-05 16:08:29

182

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Derivation of null-quantified implication.

Published on 05 Jan 2018 - 16:08

score 254 · Answer 2 · 2018-01-09 14:20:54

254

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Inference rules for quantifiers in natural deduction - are all the conditions correct?

Published on 09 Jan 2018 - 14:20

score 172 · Answer 3 · 2018-01-10 14:09:57

172

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Is the following set of inference rules for quantifiers in ND correct?

Published on 10 Jan 2018 - 14:09

score 3.5k · Answer 4 · 2011-05-21 14:40:38

3.5k

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What is the so-called eigenvariable or parameter in natural deduction?

Published on 21 May 2011 - 14:40

score 169 · Answer 5 · 2011-05-24 08:59:42

169

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What's wrong with this inference in natural deduction?

Published on 24 May 2011 - 8:59

score 1.7k · Answer 6 · 2012-04-23 12:32:10

1.7k

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Classical contradiction in logic

Published on 23 Apr 2012 - 12:32

score 1.4k · Answer 7 · 2012-10-22 22:53:29

1.4k

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Natural deduction predicate logic

Published on 22 Oct 2012 - 22:53

score 307 · Answer 8 · 2013-02-02 05:50:59

307

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Prove: $(p \lor q) \land (\lnot p \lor \lnot q) \Rightarrow (p \land \lnot q) \lor (\lnot p \land q)$ using natural deduction.

Published on 02 Feb 2013 - 5:50

score 79 · Answer 9 · 2020-08-07 17:18:31

79

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Line $L$ is tangent to the circle at $P$. Prove that no other point on $L$ can possibly intersect the circle.

Published on 07 Aug 2020 - 17:18

score 278 · Answer 10 · 2026-02-23 18:49:02

278

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The interpretation of $\nvdash$

Published on 23 Feb 2026 - 18:49

score 95 · Answer 11 · 2020-08-12 10:13:38

95

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Find a counter-model for a system for $\forall x (S(x) \lor T(x)) \vdash \forall x S(x) \lor \forall x T(x)$ or a proof of natural deduction

Published on 12 Aug 2020 - 10:13

score 81 · Answer 12 · 2020-08-30 17:29:25

81

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Is my understanding of how not to use the ($\rightarrow$ Introduction) rule correct?

Published on 30 Aug 2020 - 17:29

score 496 · Answer 13 · 2026-03-29 02:29:06

496

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Is this a correct natural deduction proof?

Published on 29 Mar 2026 - 2:29

score 783 · Answer 14 · 2026-03-29 02:29:09

783

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Proving logical equivalence using Natural Deduction

Published on 29 Mar 2026 - 2:29

score 3.7k · Answer 15 · 2020-09-02 18:20:31

3.7k

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Prove $A \rightarrow B \vdash \neg A \vee B$, using Natural Deduction

Published on 02 Sep 2020 - 18:20

List Question

Derivation of null-quantified implication.

Inference rules for quantifiers in natural deduction - are all the conditions correct?

Is the following set of inference rules for quantifiers in ND correct?

What is the so-called eigenvariable or parameter in natural deduction?

What's wrong with this inference in natural deduction?

Classical contradiction in logic

Natural deduction predicate logic

Prove: $(p \lor q) \land (\lnot p \lor \lnot q) \Rightarrow (p \land \lnot q) \lor (\lnot p \land q)$ using natural deduction.

Line $L$ is tangent to the circle at $P$. Prove that no other point on $L$ can possibly intersect the circle.

The interpretation of $\nvdash$

Find a counter-model for a system for $\forall x (S(x) \lor T(x)) \vdash \forall x S(x) \lor \forall x T(x)$ or a proof of natural deduction

Is my understanding of how not to use the ($\rightarrow$ Introduction) rule correct?

Is this a correct natural deduction proof?

Proving logical equivalence using Natural Deduction

Prove $A \rightarrow B \vdash \neg A \vee B$, using Natural Deduction

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