This page is keyboard accessible:
• Use Tab, Shift + Tab keys to traverse the main menu. To enter a sub-menu use the Right Arrow key. To leave a sub-menu use the Left Arrow or the Escape key.
• The Enter or the Space key opens the active menu item.
• To skip the menu and move to the main content, press Tab after the page loads to reveal a skip button.
• To get back to the top of the page anytime, press the Home key.
• For more information, click here: Accessibility   Close this tip.

Note: Full functionality of this web page requires JavaScript to be enabled in your browser.


Mathematics - grounded in logic?

There is an interesting webpage ( that states:


“Pseudo-mathematics is any work, study or activity which claims to be mathematical, but refuses to work within the standards of proof and rigour which mathematics is subject to … Unfortunately for practitioners of pseudo-mathematics, mathematics is an absolute science of black and white - everything is right or wrong. There is no often scope for debate or discussion, as only mathematical proof is relevant.”


If only everything was as black and white as that suggests. The reality is that there are numerous mathematical statements which are widely accepted as correct by the vast majority of mathematicians, in spite of there not actually being a rigorous proof of the statement. The fact is that a mathematician cannot possibly examine every proof, and that means that he often relies on what he perceives to be the commonly accepted belief. In most cases, the commonly accepted belief that there is a rigorous proof of a certain mathematical statement is correct, but that is not always the case.


There are well-documented instances where errors in mathematical proofs have not been discovered for several years after they were first published, including proofs that received widespread attention (see, for example, Kempe’s flawed proof and Tait’s flawed proof). And these were not proofs where one language makes statements about another language, and where there is a possibility of language confusion.


What is so curious about mathematicians is that you would expect that if someone points out that a proof is not sufficiently rigorous, or that it includes an inadmissible step, the mathematician would be grateful that that was brought to his attention. But what actually happens? When it is pointed out that certain proofs, such as various proofs of incompleteness, including Gödel’s original proof and many other proofs of incompleteness (see The flaw in Gödel’s incompleteness proof: here and Analysis of incompleteness proofs: here) are not actually as rigorous as a mathematical proof should be, mathematicians refuse to accept the facts. When it is pointed out that such a proof includes an unproven assumption instead of a rigorous logical argument, or when it is pointed out that a step in the proof relies on a step that is mathematically inadmissible, they seem to take it as an affront, as an insult to their self-perception as bastions of absolute correctness.


For more on why the use of term ‘mathematical proof’ can mean something quite different to a perfectly rigorous logically reasoned argument, see the page Mathematical Proof.


Pseudo-logic and pseudo-mathematics

So, we know that there must be proofs that are not in fact rigorous mathematical proofs, but which, for one reason or another, have been accepted as correct, in spite of failing to meet the criteria for a rigorous mathematical proof. Surely this is not acceptable? Preconceived notions about the correctness of proofs should be set aside, and proofs should be subjected to a logical critical analysis. If a proof fails the test that requires it to be a rigorous mathematical proof, then its result should not be accepted. This rooting out of pseudo-proofs should be just one step in an inevitable, if slow, step towards a more complete understanding of how language, logic and mathematics are interrelated. Mathematics and logic cannot be fully understood unless the role of language is taken in account. Confusions such as those that appear in Gödel’s proof of incompleteness (see The flaw in Gödel’s proof: here) and various other proofs of incompleteness (see Analysis of Incompleteness Proofs: here) masquerade as genuine logic and genuine mathematics, whereas in reality they are the antithesis of real logic and real mathematics.

section divider



Diverse opinions and criticisms are welcome, but messages that are frivolous, irrelevant or devoid of logical basis will be blocked. Difficulties in understanding the site content are usually best addressed by contacting me by e-mail. Note: you will be asked to provide an e-mail address - any address will do, it does not require verification. Your e-mail will only be used to notify you of replies to your comments - it will never be used for any other purpose and will not be displayed. If you cannot see any comments below, see Why isn’t the comment box loading?.

section divider

The Lighter Side


Paper on the diagonal proof

There is now a paper that deals with the matter of language and the diagonal proof, see On Considerations of Language in the Diagonal Proof.

section divider

Other recently added pages

The Myths of Platonism


Goodman’s Paradox


The Platonist Rod paradox


The Balls in the Urn Paradox


section divider

Lebesgue Measure

There is now a new page on a contradiction in Lebesgue measure theory.

section divider

Easy Footnotes

I found that making, adding or deleting footnotes in the traditional manner proved to be a major pain. So I developed a different system for footnotes which makes inserting or changing footnotes a doddle. You can check it out at Easy Footnotes for Web Pages (Accessibility friendly).

section divider

O’Connor’s “computer checked” proof

I have now added a new section to my paper on Russell O’Connor’s claim of a computer verified incompleteness proof. This shows that the flaw in the proof arises from a reliance on definitions that include unacceptable assumptions - assumptions that are not actually checked by the computer code. See also the new page Representability.

Previous Blog Posts

Moderate Platonism

Descartes’ Platonism

The duplicity of Mark Chu-Carroll

A John Searle Inanity

Man versus Machine

Fake News and Fake Mathematics

Ned Block’s Blockhead

Are we alone in the Universe?

Good Math, Bad Math?

Bishops Dancing with Pixies?

Artificial Intelligence

Cranks and Crackpots

The Chinese Room


For convenience, there are now two pages on this site with links to various material relating to Gödel and the Incompleteness Theorem


– a page with general links:

Gödel Links


– and a page relating specifically to the Gödel mind-machine debate:

Gödel, Minds, and Machines

Printer Friendly

All pages on this website are printer friendly, and will print the main content in a convenient format. Note that the margins are set by your browser print settings.

Note: for some browsers JavaScript must be enabled for this to operate correctly.


Comments on this site are welcome, please see the comment section.


Please note that this web site, like any other is a collection of various statements. Not all of this web site is intended to be factual. Some of it is personal opinion or interpretation.


If you prefer to ask me directly about the material on this site, please send me an e-mail with your query, and I will attempt to reply promptly.


Feedback about site design would also be appreciated so that I can improve the site.

Copyright © James R Meyer 2012 - 2018