Question

Trying to solve $(p\rightarrow(q\rightarrow r))\wedge\neg r\vdash p\rightarrow\neg q$ with natural deduction (fitch style)

score 135 · Answer 1 · 2020-02-18 14:02:12

135

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Trying to solve $(p\rightarrow(q\rightarrow r))\wedge\neg r\vdash p\rightarrow\neg q$ with natural deduction (fitch style)

Published on 18 Feb 2020 - 14:02

score 1.2k · Answer 2 · 2020-02-25 11:22:15

1.2k

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On the reiteration (or repetition) rule in natural deduction: is the rule "obvious" or does it need a proof?

Published on 25 Feb 2020 - 11:22

score 286 · Answer 3 · 2020-02-27 11:36:51

286

Views

What if we don't accept ex falso quodlibet?

Published on 27 Feb 2020 - 11:36

score 233 · Answer 4 · 2020-02-27 13:38:48

233

Views

How to embed the " epsilon / delta" definition of a limit in a formal proof in natural deduction style with quantifiers?

Published on 27 Feb 2020 - 13:38

score 179 · Answer 5 · 2020-03-03 20:28:06

179

Views

Strategies to work backward and forward when doing natural deduction proof

Published on 03 Mar 2020 - 20:28

score 175 · Answer 6 · 2020-03-04 19:37:00

175

Views

Proving $(A \lor ¬B) \rightarrow (A \rightarrow B)$ is a tautology with Fitch-style deduction

Published on 04 Mar 2020 - 19:37

score 124 · Answer 7 · 2020-03-04 20:08:02

124

Views

Proving $A \rightarrow B \therefore \neg A \lor B$

Published on 04 Mar 2020 - 20:08

score 227 · Answer 8 · 2020-03-05 18:54:28

227

Views

Proving $A \to (B \vee C) \therefore (A \to B) \vee (A \to C)$

Published on 05 Mar 2020 - 18:54

score 187 · Answer 9 · 2020-03-06 22:30:30

187

Views

Proving $((A \to B) \to B) \to B$ is a tautology

Published on 06 Mar 2020 - 22:30

score 164 · Answer 10 · 2020-03-08 13:12:57

164

Views

On the application of Modus Tollens rule

Published on 08 Mar 2020 - 13:12

score 301 · Answer 11 · 2020-03-12 18:40:39

301

Views

Using $\exists$ Elimination rule to prove an argument (Fitch-style)

Published on 12 Mar 2020 - 18:40

score 38 · Answer 12 · 2020-03-14 23:14:38

38

Views

On the usage of different names to prove qualification over two variables (Fitch-style)

Published on 14 Mar 2020 - 23:14

score 598 · Answer 13 · 2020-03-15 14:59:02

598

Views

Showing two sentences are provably equivalent (Fitch-style)

Published on 15 Mar 2020 - 14:59

score 298 · Answer 14 · 2020-03-15 17:16:32

298

Views

Show that given a contradiction you can assume anything

Published on 15 Mar 2020 - 17:16

score 72 · Answer 15 · 2020-03-16 12:32:16

72

Views

On the application of $\forall\mathbf{I}$ rule

Published on 16 Mar 2020 - 12:32

List Question

Trying to solve $(p\rightarrow(q\rightarrow r))\wedge\neg r\vdash p\rightarrow\neg q$ with natural deduction (fitch style)

On the reiteration (or repetition) rule in natural deduction: is the rule "obvious" or does it need a proof?

What if we don't accept ex falso quodlibet?

How to embed the " epsilon / delta" definition of a limit in a formal proof in natural deduction style with quantifiers?

Strategies to work backward and forward when doing natural deduction proof

Proving $(A \lor ¬B) \rightarrow (A \rightarrow B)$ is a tautology with Fitch-style deduction

Proving $A \rightarrow B \therefore \neg A \lor B$

Proving $A \to (B \vee C) \therefore (A \to B) \vee (A \to C)$

Proving $((A \to B) \to B) \to B$ is a tautology

On the application of Modus Tollens rule

Using $\exists$ Elimination rule to prove an argument (Fitch-style)

On the usage of different names to prove qualification over two variables (Fitch-style)

Showing two sentences are provably equivalent (Fitch-style)

Show that given a contradiction you can assume anything

On the application of $\forall\mathbf{I}$ rule

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