List questions from natural-deduction

Published on 06 Jan 2019 - 19:00

154

Views

Why is "If ψ ∈ Γ then the sequent (Γ ⊢ ψ) is correct" true?

Published on 23 Feb 2026 - 4:55

44

Views

What workbooks (guidelines) can be helpful for solving math logical exercies?

Published on 19 Jan 2019 - 23:16

326

Views

How to use natural deduction to show $\neg (P \land Q) \vdash \neg P \lor \neg Q$?

Published on 21 Jan 2019 - 17:33

137

Views

translating a usual proof into natural deduction.

Published on 25 Jan 2019 - 14:11

597

Views

How can I prove the following with natural deduction rules? $¬∀x∃yP(x,y) ⊢ ∃x∀y¬P(x,y)$

Published on 25 Jan 2019 - 20:55

953

Views

How to prove the following formula using an indirect proof

Published on 26 Jan 2019 - 21:17

148

Views

Proving $\exists ! x (t = x)$ constructively without double negation axiom

Published on 29 Jan 2019 - 6:45

167

Views

Formal Deduction (logic) Question: $\lnot C, (B \to \lnot C) \to A \vdash (A \to C) \to F$

Published on 02 Feb 2019 - 23:43

144

Views

Proof of $(P\to Q) \vee (Q\to P)$ with natural deduction

Published on 04 Feb 2019 - 10:02

177

Views

Using natural deduction to prove that $p \implies q \vdash \lnot p \lor q$

Published on 08 Feb 2019 - 12:46

67

Views

Natural deduction - formal proof troubles

Published on 09 Feb 2019 - 16:39

84

Views

Is this proof in natural deduction proof system correct?

Published on 09 Feb 2019 - 20:35

3.2k

Views

Formal proof of one of De Morgan's laws

Published on 22 Mar 2026 - 17:50

1.2k

Views

Trouble with negation introduction with Fitch natural deduction proof

Published on 09 Feb 2019 - 21:55

List Question

Show that the proof rule is not sound and proof question

Why is "If ψ ∈ Γ then the sequent (Γ ⊢ ψ) is correct" true?

What workbooks (guidelines) can be helpful for solving math logical exercies?

How to use natural deduction to show $\neg (P \land Q) \vdash \neg P \lor \neg Q$?

translating a usual proof into natural deduction.

How can I prove the following with natural deduction rules? $¬∀x∃yP(x,y) ⊢ ∃x∀y¬P(x,y)$

How to prove the following formula using an indirect proof

Proving $\exists ! x (t = x)$ constructively without double negation axiom

Formal Deduction (logic) Question: $\lnot C, (B \to \lnot C) \to A \vdash (A \to C) \to F$

Proof of $(P\to Q) \vee (Q\to P)$ with natural deduction

Using natural deduction to prove that $p \implies q \vdash \lnot p \lor q$

Natural deduction - formal proof troubles

Is this proof in natural deduction proof system correct?

Formal proof of one of De Morgan's laws

Trouble with negation introduction with Fitch natural deduction proof

Trending Questions

Popular # Hahtags

Popular Questions