Question

Main differences and relations between Sequent Calculus and Natural Deduction

score 3k · Answer 1 · 2026-02-23 10:15:35

3k

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Main differences and relations between Sequent Calculus and Natural Deduction

Published on 23 Feb 2026 - 10:15

score 1.4k · Answer 2 · 2026-02-23 10:14:21

1.4k

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Is everything provable as true, false, or undecidable?

Published on 23 Feb 2026 - 10:14

score 994 · Answer 3 · 2016-12-25 17:48:33

994

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Using logic symbols "fluently" in mathematics. How can I show that one set of conditions, represented by logic symbols, is independent of another?

Published on 25 Dec 2016 - 17:48

score 610 · Answer 4 · 2016-12-26 11:55:16

610

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How should we see the role of deduction systems like NK, NJ, LK, LJ?

Published on 26 Dec 2016 - 11:55

score 3.1k · Answer 5 · 2016-12-26 17:31:45

3.1k

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What is the role of associative and commutative properties in Mathematics and what if someone want to prove them??

Published on 26 Dec 2016 - 17:31

score 229 · Answer 6 · 2026-03-26 19:09:24

229

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Two theories proving each others' consistency, take 2

Published on 26 Mar 2026 - 19:09

score 2.9k · Answer 7 · 2017-01-03 04:07:43

2.9k

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Can every true theorem that has a proof be proven by contradiction?

Published on 03 Jan 2017 - 4:07

score 202 · Answer 8 · 2026-03-27 00:58:04

202

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The difference between $ZF$ $-$ _Inf_ and $ZF$ $-$ _Inf_ + $\lnot$_Inf_ and the difference it makes

Published on 27 Mar 2026 - 0:58

score 285 · Answer 9 · 2017-01-07 10:16:32

285

Views

Formal proof of sentence in first-order calculus, example.

Published on 07 Jan 2017 - 10:16

score 251 · Answer 10 · 2017-01-10 15:58:28

251

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Proof-theoretic ordinals and the Axioms of Replacement

Published on 10 Jan 2017 - 15:58

score 356 · Answer 11 · 2026-03-26 12:36:40

356

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Is there a constructive well-ordering on the set of finite rooted trees?

Published on 26 Mar 2026 - 12:36

score 175 · Answer 12 · 2017-01-15 00:25:28

175

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Proving theorems via Löb's theorem

Published on 15 Jan 2017 - 0:25

score 622 · Answer 13 · 2017-01-18 18:36:41

622

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Broken spaghetti problem to ACUTE triangles

Published on 18 Jan 2017 - 18:36

score 359 · Answer 14 · 2026-03-28 15:26:56

359

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How does one prove that proof by contradiction has completely and utterly failed?

Published on 28 Mar 2026 - 15:26

score 46 · Answer 15 · 2026-02-23 10:13:39

46

Views

Why is this sequent generalization valid?

Published on 23 Feb 2026 - 10:13

List Question

Main differences and relations between Sequent Calculus and Natural Deduction

Is everything provable as true, false, or undecidable?

Using logic symbols "fluently" in mathematics. How can I show that one set of conditions, represented by logic symbols, is independent of another?

How should we see the role of deduction systems like NK, NJ, LK, LJ?

What is the role of associative and commutative properties in Mathematics and what if someone want to prove them??

Two theories proving each others' consistency, take 2

Can every true theorem that has a proof be proven by contradiction?

The difference between $ZF$ $-$ _Inf_ and $ZF$ $-$ _Inf_ + $\lnot$_Inf_ and the difference it makes

Formal proof of sentence in first-order calculus, example.

Proof-theoretic ordinals and the Axioms of Replacement

Is there a constructive well-ordering on the set of finite rooted trees?

Proving theorems via Löb's theorem

Broken spaghetti problem to ACUTE triangles

How does one prove that proof by contradiction has completely and utterly failed?

Why is this sequent generalization valid?

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