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Philosophical aspects of logic and set theory; truth status of mathematical axioms; Philosophy of Mathematics; philosophical aspects of mathematics in general; relation of mathematics to philosophy; etc. Consider also posting at http://philosophy.stackexchange.com/, where philosophy-of-mathematics is one of the most popular tags.

69 votes
5 answers
9k views

What was Hilbert's view of Gödel's Incompleteness Theorems?

According to Solomon Feferman, in his slide presentation "Three Problems for Mathematics", Hilbert wrote (in regards to Gödel's second incompleteness theorem): ...the end goal [is] to establish as …
Thomas Benjamin's user avatar
45 votes
1 answer
3k views

Hilbert's alleged proof of the Continuum Hypothesis in "On the Infinite"

As is known, Hilbert attempted a proof sketch of the Continuum Hypothesis in the latter part of his paper, "On the Infinite". It is also known that it is false. Has there ever been a published analy …
Thomas Benjamin's user avatar
10 votes
1 answer
831 views

Are there 'finitistic' nonrecursive functions (assuming Church's Thesis is false)?

[Note: In what follows, I will be using the same type of argument Laszlo Kalmar did in his paper "An Argument Against the Plausibility of Church's Thesis" found in Constructivity in Mathematics, (Amst …
Thomas Benjamin's user avatar
9 votes
1 answer
999 views

How are material set theory and structural set theory related from the point of view of cate...

In his comments to both cody and Nik Weaver regarding his answer to user7280899's mathoverflow question "What kind of foundation are mathematicians using when proving metatheorems?", Mike Shulman writ …
Thomas Benjamin's user avatar
7 votes

Belief in consistency of extremely large cardinals

There is another path that can be used to justify the existence of very large cardinals. Consider, for example, the abstract to Magidor's paper, "On the Role of Supercompact and Extendible Cardinals …
Thomas Benjamin's user avatar
7 votes

Why hasn't mereology succeeded as an alternative to set theory?

Considering the nature of your question, you might be interested in the following paper by Geoffrey Hellman and Stewart Shapiro: "The Classical Continuum without Points", The Review of Symbolic Logic …
Thomas Benjamin's user avatar
6 votes
1 answer
206 views

Is $PRA$ + $TI({\epsilon_0})$ mutually interpretable with some theory in the language of set...

As is well known, the following theory is equiconsistent with $PA$: $ZFC$ with the axiom of infinity replaced by its negation. Since this theory is equiconsistent with $PA$, it would seem reason …
Thomas Benjamin's user avatar
6 votes
3 answers
3k views

The Lucas argument vs the theorem-provers -- who wins and why?

In his paper, "Minds, Machines and Gödel", J.R. Lucas writes the following: Gödel's theorem [First Incompleteness Theorem, that is—my comment] must apply to cybernetic machines, because it is of t …
Thomas Benjamin's user avatar
5 votes
0 answers
320 views

Can the Kunen inconsistency (or the existence of Reinhardt cardinals) be 'properly formulate...

In their paper "Generalizations of the Kunen Inconsistency" (arXiv:1106.1951v1 [math.LO]10 Jun. 2011), Hamkins, Kirmayer, and Perlmutter write the following: The first [metamathematical issue--my …
Thomas Benjamin's user avatar
5 votes
0 answers
940 views

Why are real-valued measurable cardinals never explicitly mentioned in Gödel's "What is Cant...

It is a matter of mathematical folklore that Gödel "entertained the idea of so called stronger axioms of infinity deciding $CH$...." (this quote from Radek Honzik's paper, "Large cardinals and the Co …
Thomas Benjamin's user avatar
5 votes
1 answer
475 views

Extensions of the Ackermann interpretation to nonstandard theories of arithmetic

In their paper, " On Interpretations of Arithmetic and Set Theory" (Notre Dame Journal of Formal Logic, Vol. 8, No. 4 (2007), pp. 497-510) in section 7, "Fragments of Arithmetic and Set Theory", Kaye …
Thomas Benjamin's user avatar
4 votes

Why should we believe in the axiom of regularity?

Consider first the Unrestricted Axiom of Comprehension ($\exists$y)($\forall$x)(x$\in$y $\leftrightarrow$ $\phi$(x)) and the resulting Russell paradox y$\in$y $\leftrightarrow$ y$\notin$y One can cert …
Thomas Benjamin's user avatar
3 votes

Has Dedekind's proof of existence of infinite sets been analyzed by historians?

You might want to take a look at Greg Oman's preprint "Unifying Some Notions Of Infinity In $ZC$ and $ZF$", It was to appear in Reports on Mathematical Logic, but you can find the preprint in …
Thomas Benjamin's user avatar
3 votes
0 answers
342 views

A Question Regarding Boolean-valued Models

What were the intuitions motivating the creation (or discovery, if you will) of Boolean-valued models? I have searched for the Scott-Solovay paper on the subject, but to no avail. There also seems to …
Thomas Benjamin's user avatar
3 votes
1 answer
618 views

Are the paradoxes of material or strict implication used anywhere to prove theorems in mathe...

In the Stanford Encyclopedia of Philosophy entry "Relevance Logic", the following inference is listed as classically valid: The moon is made of green cheese. Therefore, it is raining in Ecuador n …
Thomas Benjamin's user avatar

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