Question

Show $\neg(\forall x\phi)\vdash \exists x(\neg \phi)$ using an ND-derivation

score 300 · Answer 1 · 2019-04-07 18:44:20

300

Views

Show $\neg(\forall x\phi)\vdash \exists x(\neg \phi)$ using an ND-derivation

Published on 07 Apr 2019 - 18:44

score 93 · Answer 2 · 2019-04-08 17:11:58

93

Views

Is there a non-empty domain such that its constant terms satisfy a conclusion?

Published on 08 Apr 2019 - 17:11

score 282 · Answer 3 · 2019-04-13 05:12:24

282

Views

Making assumption in natural deduction proof

Published on 13 Apr 2019 - 5:12

score 56 · Answer 4 · 2019-04-18 21:38:18

56

Views

Help me with this propositional logic demonstration

Published on 18 Apr 2019 - 21:38

score 77 · Answer 5 · 2019-04-24 11:05:43

77

Views

Natural deduction proof: C Ʌ D, C ↔ E, D ↔ F |- E Ʌ F

Published on 24 Apr 2019 - 11:05

score 987 · Answer 6 · 2019-04-24 11:29:26

987

Views

Natural deduction proof: $A \vee (B \wedge C) ├ (A \vee B) \wedge (A \vee C)$

Published on 24 Apr 2019 - 11:29

score 269 · Answer 7 · 2019-05-01 14:59:36

269

Views

Fitch natural deduction proof of $\neg D, A \to B, B \to (C \lor D), A \lor C \vdash C$

Published on 01 May 2019 - 14:59

score 308 · Answer 8 · 2019-05-04 15:03:29

308

Views

Fitch natural deduction proof with no conditionals

Published on 04 May 2019 - 15:03

score 602 · Answer 9 · 2019-05-04 17:50:20

602

Views

Fitch natural deduction proof of $\vdash (\neg P \lor Q) \to (P \to Q)$

Published on 04 May 2019 - 17:50

score 519 · Answer 10 · 2019-05-04 21:14:47

519

Views

Fitch natural deduction proof of $\forall x F(x) \lor \forall x G(x) \vdash \forall x (F(x) \lor G(x))$

Published on 04 May 2019 - 21:14

score 214 · Answer 11 · 2019-05-05 18:05:17

214

Views

Fitch natural deduction proof of $(P \to Q) \land R, (P \land R) \to S, \neg S \vdash P \to (Q \land R)$

Published on 05 May 2019 - 18:05

score 322 · Answer 12 · 2026-02-23 06:42:28

322

Views

Negation Inference with Gentzen Natural Deduction and Sequents?

Published on 23 Feb 2026 - 6:42

score 195 · Answer 13 · 2019-05-09 11:49:35

195

Views

Proving the sequent $A \implies B \vdash \lnot A \lor B$ using natural deduction

Published on 09 May 2019 - 11:49

score 212 · Answer 14 · 2019-05-12 09:44:15

212

Views

Fitch natural deduction proof of $\forall x (P(x) \to Q(x)) \to (\forall x (P(x)) \to \forall x (Q(x))$

Published on 12 May 2019 - 9:44

score 710 · Answer 15 · 2019-05-13 07:30:53

710

Views

Natural Deduction Proof: A ↔ B |- (C → A) → (C → B)

Published on 13 May 2019 - 7:30

List Question

Show $\neg(\forall x\phi)\vdash \exists x(\neg \phi)$ using an ND-derivation

Is there a non-empty domain such that its constant terms satisfy a conclusion?

Making assumption in natural deduction proof

Help me with this propositional logic demonstration

Natural deduction proof: C Ʌ D, C ↔ E, D ↔ F |- E Ʌ F

Natural deduction proof: $A \vee (B \wedge C) ├ (A \vee B) \wedge (A \vee C)$

Fitch natural deduction proof of $\neg D, A \to B, B \to (C \lor D), A \lor C \vdash C$

Fitch natural deduction proof with no conditionals

Fitch natural deduction proof of $\vdash (\neg P \lor Q) \to (P \to Q)$

Fitch natural deduction proof of $\forall x F(x) \lor \forall x G(x) \vdash \forall x (F(x) \lor G(x))$

Fitch natural deduction proof of $(P \to Q) \land R, (P \land R) \to S, \neg S \vdash P \to (Q \land R)$

Negation Inference with Gentzen Natural Deduction and Sequents?

Proving the sequent $A \implies B \vdash \lnot A \lor B$ using natural deduction

Fitch natural deduction proof of $\forall x (P(x) \to Q(x)) \to (\forall x (P(x)) \to \forall x (Q(x))$

Natural Deduction Proof: A ↔ B |- (C → A) → (C → B)

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