Question

Logical deduction in predicate calculus from a reflexive predicate

score 90 · Answer 1 · 2021-05-30 20:34:38

90

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Logical deduction in predicate calculus from a reflexive predicate

Published on 30 May 2021 - 20:34

score 108 · Answer 2 · 2021-06-06 14:01:05

108

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Prove that $P \implies Q \vdash \neg Q \implies\lnot P$

Published on 06 Jun 2021 - 14:01

score 733 · Answer 3 · 2026-03-29 07:34:34

733

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Fitch natural deduction proof of $\exists xF(x) \lor \exists xG(x) \vdash \exists x (F(x) \lor G(x))$

Published on 29 Mar 2026 - 7:34

score 422 · Answer 4 · 2021-06-16 19:07:48

422

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Fitch natural deduction proof of ∀x∀y∀z((S(x,y) ∧ S(y,z)) → S(x,z)), ∀x¬S(x,x) ⊢ ∀x∀y (S(x,y) → ¬S(y,x))

Published on 16 Jun 2021 - 19:07

score 313 · Answer 5 · 2021-06-23 20:51:22

313

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Why is modus ponens a valid form?

Published on 23 Jun 2021 - 20:51

score 161 · Answer 6 · 2021-06-30 17:31:43

161

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natural deduction with two quantifiers on both sides of the double implication

Published on 30 Jun 2021 - 17:31

score 97 · Answer 7 · 2021-06-30 23:20:17

97

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How to complete the follow natural deduction in bottom-up method

Published on 30 Jun 2021 - 23:20

score 121 · Answer 8 · 2021-07-15 09:39:43

121

Views

How do I prove this in natural deduction calculus?

Published on 15 Jul 2021 - 9:39

score 930 · Answer 9 · 2021-07-26 08:39:42

930

Views

Textbook for Fitch-style Natural Deduction.

Published on 26 Jul 2021 - 8:39

score 110 · Answer 10 · 2021-07-29 04:29:20

110

Views

Modern Reference for Natural Deduction Proof that Logical Extension by Definition is Conservative

Published on 29 Jul 2021 - 4:29

score 54 · Answer 11 · 2021-08-10 17:20:59

54

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Natural deduction: is $y$ free in $\forall x.p(x)$

Published on 10 Aug 2021 - 17:20

score 3k · Answer 12 · 2021-08-15 04:12:54

3k

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Prove that $2^{n+1}>(n+2) \cdot \sin(n)$ for all positive integers n.

Published on 15 Aug 2021 - 4:12

score 291 · Answer 13 · 2021-08-31 13:53:08

291

Views

Natural deduction proof of ¬p ∨ q ⊢ ¬(¬p → q)

Published on 31 Aug 2021 - 13:53

score 423 · Answer 14 · 2021-09-03 06:29:07

423

Views

Is this a correct derivation of Peirce's law?

Published on 03 Sep 2021 - 6:29

score 184 · Answer 15 · 2026-02-23 20:35:17

184

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Proving Sequent Calculus Statement

Published on 23 Feb 2026 - 20:35

List Question

Logical deduction in predicate calculus from a reflexive predicate

Prove that $P \implies Q \vdash \neg Q \implies\lnot P$

Fitch natural deduction proof of $\exists xF(x) \lor \exists xG(x) \vdash \exists x (F(x) \lor G(x))$

Fitch natural deduction proof of ∀x∀y∀z((S(x,y) ∧ S(y,z)) → S(x,z)), ∀x¬S(x,x) ⊢ ∀x∀y (S(x,y) → ¬S(y,x))

Why is modus ponens a valid form?

natural deduction with two quantifiers on both sides of the double implication

How to complete the follow natural deduction in bottom-up method

How do I prove this in natural deduction calculus?

Textbook for Fitch-style Natural Deduction.

Modern Reference for Natural Deduction Proof that Logical Extension by Definition is Conservative

Natural deduction: is $y$ free in $\forall x.p(x)$

Prove that $2^{n+1}>(n+2) \cdot \sin(n)$ for all positive integers n.

Natural deduction proof of ¬p ∨ q ⊢ ¬(¬p → q)

Is this a correct derivation of Peirce's law?

Proving Sequent Calculus Statement

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