Logic and Philosophy of Mathematics

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Does anyone here actually understand formal proofs of mathematical logic?

Last post by Eodnhoj7 « Tue Aug 20, 2019 5:47 pm
Replies: 134
by PeteOlcott » Mon May 13, 2019 10:23 pm
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33952 Views

Last post by Eodnhoj7
Tue Aug 20, 2019 5:47 pm
1 = 0 = infinity

Last post by Eodnhoj7 « Sun Aug 18, 2019 2:35 am
Replies: 70
by Eodnhoj7 » Wed Aug 14, 2019 11:52 pm
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13093 Views

Last post by Eodnhoj7
Sun Aug 18, 2019 2:35 am
Tarski undefinability totally refuted by junior high school logic

Last post by Eodnhoj7 « Fri Aug 16, 2019 10:49 pm
Replies: 1
by PeteOlcott » Thu May 23, 2019 4:11 am

1 Replies

1024 Views

Last post by Eodnhoj7
Fri Aug 16, 2019 10:49 pm
How can this possibly fail to partition True(x) from Untrue(x) for every formal system?

Last post by Eodnhoj7 « Fri Aug 16, 2019 10:45 pm
Replies: 1
by PeteOlcott » Wed May 22, 2019 8:14 pm

1 Replies

958 Views

Last post by Eodnhoj7
Fri Aug 16, 2019 10:45 pm
Refuting Gödel's 1931 Incompleteness Theorem in one sentence

Last post by Eodnhoj7 « Thu Aug 15, 2019 2:09 am
Replies: 121
by PeteOlcott » Thu May 16, 2019 3:30 pm
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22786 Views

Last post by Eodnhoj7
Thu Aug 15, 2019 2:09 am
Simplest possible notion of a formal system

Last post by Eodnhoj7 « Wed Aug 14, 2019 1:14 am
Replies: 69
by PeteOlcott » Fri Aug 09, 2019 6:36 pm
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69 Replies

14199 Views

Last post by Eodnhoj7
Wed Aug 14, 2019 1:14 am
Eliminating Undecidability and Incompleteness in Formal Systems

Last post by Eodnhoj7 « Tue Aug 06, 2019 11:58 pm
Replies: 71
by PeteOlcott » Mon Apr 15, 2019 9:00 pm
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71 Replies

16484 Views

Last post by Eodnhoj7
Tue Aug 06, 2019 11:58 pm
Let me convince you that none of you are Classical logicians!

Last post by Sculptor « Tue Aug 06, 2019 11:09 pm
Replies: 368
by Logik » Fri Feb 22, 2019 6:12 pm
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368 Replies

71823 Views

Last post by Sculptor
Tue Aug 06, 2019 11:09 pm
The Number System as a Model of The Process of Evolution

Last post by wtf « Thu Jul 11, 2019 12:22 am
Replies: 68
by roydop » Thu Feb 28, 2019 3:04 pm
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68 Replies

24463 Views

Last post by wtf
Thu Jul 11, 2019 12:22 am
Why Philosophers Should Care About Computational Complexity

Last post by Eodnhoj7 « Mon Jul 08, 2019 4:43 pm
Replies: 31
by Univalence » Wed Jun 05, 2019 6:40 am
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10047 Views

Last post by Eodnhoj7
Mon Jul 08, 2019 4:43 pm
Is this simplest version of the Liar Paradox: ∃LP (LP ↔ ⊢¬LP) refutable?

Last post by Eodnhoj7 « Fri Jun 07, 2019 6:38 pm
Replies: 5
by PeteOlcott » Mon May 27, 2019 4:48 pm

5 Replies

1641 Views

Last post by Eodnhoj7
Fri Jun 07, 2019 6:38 pm
Mathematics = Maya

Last post by PeteJ « Fri Jun 07, 2019 4:50 pm
Replies: 7
by roydop » Tue Mar 05, 2019 3:00 pm

7 Replies

2375 Views

Last post by PeteJ
Fri Jun 07, 2019 4:50 pm
Any science of logic?

Last post by RCSaunders « Fri May 31, 2019 7:01 pm
Replies: 105
by Speakpigeon » Sun May 12, 2019 6:10 pm
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36691 Views

Last post by RCSaunders
Fri May 31, 2019 7:01 pm
Can truth be understood as math?

Last post by Speakpigeon « Mon May 27, 2019 12:35 pm
Replies: 2
by PeteOlcott » Mon May 27, 2019 4:54 am

2 Replies

1221 Views

Last post by Speakpigeon
Mon May 27, 2019 12:35 pm
How do we say this using the notation conventions of mathematical logic?

Last post by Speakpigeon « Sun May 26, 2019 5:59 pm
Replies: 6
by PeteOlcott » Sat May 25, 2019 7:05 pm

6 Replies

2378 Views

Last post by Speakpigeon
Sun May 26, 2019 5:59 pm
A junior high school level of understanding of logic

Last post by Univalence « Sat May 25, 2019 4:43 pm
Replies: 31
by PeteOlcott » Wed May 22, 2019 4:28 pm
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31 Replies

7649 Views

Last post by Univalence
Sat May 25, 2019 4:43 pm
Possible consequences of falsifying the principle of explosion?

Last post by PeteOlcott « Sun May 12, 2019 12:19 am
Replies: 86
by Speakpigeon » Wed May 01, 2019 12:22 pm
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86 Replies

20805 Views

Last post by PeteOlcott
Sun May 12, 2019 12:19 am
Further demonstration the law of identity is broken (Sophists welcome)

Last post by Eodnhoj7 « Mon May 06, 2019 5:50 pm
Replies: 84
by Logik » Mon Mar 04, 2019 9:07 am
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84 Replies

21002 Views

Last post by Eodnhoj7
Mon May 06, 2019 5:50 pm
Converting formal proofs to conform to sound deduction

Last post by Speakpigeon « Sat May 04, 2019 9:47 pm
Replies: 30
by PeteOlcott » Tue Apr 30, 2019 4:03 pm
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30 Replies

15004 Views

Last post by Speakpigeon
Sat May 04, 2019 9:47 pm
Transforming formal proof into sound deduction (greatly simplified)

Last post by Speakpigeon « Wed May 01, 2019 5:21 pm
Replies: 59
by PeteOlcott » Mon Apr 22, 2019 6:47 am
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59 Replies

12768 Views

Last post by Speakpigeon
Wed May 01, 2019 5:21 pm
Eliminating Undecidability and Incompleteness in Formal Systems (As simple as possible)

Last post by Logik « Tue Apr 30, 2019 11:45 am
Replies: 33
by PeteOlcott » Fri Apr 26, 2019 2:53 pm
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33 Replies

6798 Views

Last post by Logik
Tue Apr 30, 2019 11:45 am
Transforming formal proof into sound deduction (rewritten)

Last post by Logik « Thu Apr 25, 2019 5:13 pm
Replies: 78
by PeteOlcott » Fri Apr 19, 2019 3:59 pm
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78 Replies

15868 Views

Last post by Logik
Thu Apr 25, 2019 5:13 pm
Gödel is really Wrong (totally rewritten)

Last post by PeteOlcott « Fri Apr 19, 2019 5:31 pm
Replies: 7
by PeteOlcott » Fri Apr 19, 2019 4:38 am

7 Replies

1701 Views

Last post by PeteOlcott
Fri Apr 19, 2019 5:31 pm
Justification of the mathematical definition of logical validity?

Last post by Speakpigeon « Fri Apr 19, 2019 1:36 pm
Replies: 6
by Speakpigeon » Thu Apr 18, 2019 11:31 am

6 Replies

1879 Views

Last post by Speakpigeon
Fri Apr 19, 2019 1:36 pm
Paradoxes of Material Implication

Last post by Logik « Wed Apr 17, 2019 11:52 pm
Replies: 62
by Garry G » Fri Apr 12, 2019 4:12 am
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14667 Views

Last post by Logik
Wed Apr 17, 2019 11:52 pm
If I can imagine it, it's logically possible?

Last post by Speakpigeon « Tue Apr 16, 2019 5:49 pm
Replies: 55
by Speakpigeon » Sat Mar 30, 2019 4:23 pm
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11611 Views

Last post by Speakpigeon
Tue Apr 16, 2019 5:49 pm
How paradoxical is this argument?

Last post by Speakpigeon « Tue Apr 16, 2019 4:55 pm
Replies: 4
by Garry G » Mon Apr 15, 2019 11:16 pm

4 Replies

1429 Views

Last post by Speakpigeon
Tue Apr 16, 2019 4:55 pm
Eliminating undecidability in formal systems

Last post by Logik « Tue Apr 16, 2019 7:31 am
Replies: 72
by PeteOlcott » Tue Apr 09, 2019 2:25 am
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12256 Views

Last post by Logik
Tue Apr 16, 2019 7:31 am
Prolog already refutes Tarski Undefinability

Last post by Logik « Tue Apr 16, 2019 6:08 am
Replies: 60
by PeteOlcott » Fri Apr 12, 2019 8:11 pm
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60 Replies

10312 Views

Last post by Logik
Tue Apr 16, 2019 6:08 am
Definition of logical validity

Last post by Garry G « Sat Apr 13, 2019 9:12 pm
Replies: 55
by Speakpigeon » Wed Jan 23, 2019 2:47 pm
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12966 Views

Last post by Garry G
Sat Apr 13, 2019 9:12 pm
Is there a sentence that proves itself is not provable?

Last post by Logik « Tue Apr 09, 2019 7:30 am
Replies: 100
by PeteOlcott » Mon Mar 25, 2019 4:51 pm
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21273 Views

Last post by Logik
Tue Apr 09, 2019 7:30 am
Origins of Mathematical/Logical questions of computability...

Last post by Speakpigeon « Sat Apr 06, 2019 5:59 pm
Replies: 1
by Scott Mayers » Thu Apr 04, 2019 5:49 am

1 Replies

874 Views

Last post by Speakpigeon
Sat Apr 06, 2019 5:59 pm
Refuting Incompleteness and Undefinability

Last post by PeteOlcott « Fri Apr 05, 2019 4:18 pm
Replies: 102
by PeteOlcott » Thu Mar 21, 2019 10:43 pm
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102 Replies

24454 Views

Last post by PeteOlcott
Fri Apr 05, 2019 4:18 pm
The Riemann Hypothesis paradox

Last post by Logik « Fri Apr 05, 2019 9:02 am
Replies: 18
by attofishpi » Wed Apr 03, 2019 1:36 pm
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5091 Views

Last post by Logik
Fri Apr 05, 2019 9:02 am
The logical error of the Liar Paradox

Last post by PeteOlcott « Thu Apr 04, 2019 12:10 am
Replies: 64
by PeteOlcott » Wed Mar 27, 2019 4:41 am
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14299 Views

Last post by PeteOlcott
Thu Apr 04, 2019 12:10 am
What is the purpose of computers?

Last post by Dontaskme « Tue Apr 02, 2019 10:58 am
Replies: 40
by Dontaskme » Fri Mar 22, 2019 8:53 am
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9416 Views

Last post by Dontaskme
Tue Apr 02, 2019 10:58 am
The arbitrary choice of the range/precision trade-off

Last post by Dontaskme « Fri Mar 22, 2019 2:19 pm
Replies: 5
by Logik » Fri Mar 22, 2019 12:38 pm

5 Replies

1510 Views

Last post by Dontaskme
Fri Mar 22, 2019 2:19 pm
Vortex Math

Last post by Logik « Wed Mar 20, 2019 2:28 pm
Replies: 7
by Eodnhoj7 » Tue Mar 05, 2019 11:34 pm

7 Replies

2313 Views

Last post by Logik
Wed Mar 20, 2019 2:28 pm
Contradicting the law of non-contradiction

Last post by Logik « Mon Mar 18, 2019 7:00 am
Replies: 40
by Logik » Sun Feb 24, 2019 2:11 pm
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12556 Views

Last post by Logik
Mon Mar 18, 2019 7:00 am
An integer=a non-integer: Mathematics ends in contradiction

Last post by Logik « Sat Mar 16, 2019 9:19 am
Replies: 1
by anne » Sat Mar 16, 2019 3:17 am

1 Replies

973 Views

Last post by Logik
Sat Mar 16, 2019 9:19 am
The limitations of Aristotelian logic:LOGIC/ESSENCE AND LANGUAGE LEAD TO THE MEANINGLESSNESS OF ALL VIEWS

Last post by Eodnhoj7 « Tue Mar 12, 2019 9:59 pm
Replies: 41
by anne » Sat Mar 02, 2019 10:25 am
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10910 Views

Last post by Eodnhoj7
Tue Mar 12, 2019 9:59 pm
The death of Classical logic and the birth of Constructive Mathematics

Last post by Eodnhoj7 « Tue Mar 12, 2019 8:23 pm
Replies: 260
by Logik » Sat Feb 23, 2019 1:25 pm
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59292 Views

Last post by Eodnhoj7
Tue Mar 12, 2019 8:23 pm
The Classical law of identity (as stated) is inconsistent

Last post by Eodnhoj7 « Mon Mar 11, 2019 7:30 pm
Replies: 32
by Logik » Sat Mar 02, 2019 7:46 am
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6368 Views

Last post by Eodnhoj7
Mon Mar 11, 2019 7:30 pm
Information is fundamental to cognition

Last post by commonsense « Wed Mar 06, 2019 11:42 pm
Replies: 53
by Logik » Tue Feb 26, 2019 8:52 am
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10804 Views

Last post by commonsense
Wed Mar 06, 2019 11:42 pm
Language(Logic), Geometry, Number Line are One through Chaos Theory

Last post by Eodnhoj7 « Wed Mar 06, 2019 10:55 pm
Replies: 17
by Eodnhoj7 » Mon Mar 04, 2019 10:31 pm
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3580 Views

Last post by Eodnhoj7
Wed Mar 06, 2019 10:55 pm
Gödel’s 1st theorem is meaningless

Last post by Eodnhoj7 « Mon Mar 04, 2019 7:38 pm
Replies: 2
by anne » Wed Feb 27, 2019 11:06 am

2 Replies

873 Views

Last post by Eodnhoj7
Mon Mar 04, 2019 7:38 pm
The Purpose of Mathematics (Math as a message/model)

Last post by roydop « Sun Mar 03, 2019 11:21 pm

by roydop » Sun Mar 03, 2019 11:21 pm

0 Replies

2104 Views

Last post by roydop
Sun Mar 03, 2019 11:21 pm
Mathematics ends in contradiction:6 reasons

Last post by Age « Sat Mar 02, 2019 5:35 pm
Replies: 136
by anne » Wed Feb 27, 2019 7:24 am
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25662 Views

Last post by Age
Sat Mar 02, 2019 5:35 pm
What the theorems of Incompleteness or Undecidability assert...

Last post by Scott Mayers « Sat Mar 02, 2019 7:31 am
Replies: 50
by Scott Mayers » Tue Feb 26, 2019 12:17 am
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13301 Views

Last post by Scott Mayers
Sat Mar 02, 2019 7:31 am
Godel's First Incompleteness theorem

Last post by Logik « Fri Mar 01, 2019 8:17 am
Replies: 2
by roydop » Fri Mar 01, 2019 1:00 am

2 Replies

1245 Views

Last post by Logik
Fri Mar 01, 2019 8:17 am

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