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Single Idea 10492

[filed under theme 4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets ]

Full Idea

Maybe the axioms of extensionality and the pair set axiom 'force themselves on us' (Gödel's phrase), but I am not convinced about the axioms of infinity, union, power or replacement.

Gist of Idea

A few axioms of set theory 'force themselves on us', but most of them don't

Source

George Boolos (Must We Believe in Set Theory? [1997], p.130)

Book Ref

Boolos,George: 'Logic, Logic and Logic' [Harvard 1999], p.130


A Reaction

Boolos is perfectly happy with basic set theory, but rather dubious when very large cardinals come into the picture.


The 10 ideas from 'Must We Believe in Set Theory?'

The logic of ZF is classical first-order predicate logic with identity [Boolos]
Mathematics and science do not require very high orders of infinity [Boolos]
The iterative conception says sets are formed at stages; some are 'earlier', and must be formed first [Boolos]
Naďve sets are inconsistent: there is no set for things that do not belong to themselves [Boolos]
It is lunacy to think we only see ink-marks, and not word-types [Boolos]
I am a fan of abstract objects, and confident of their existence [Boolos]
We deal with abstract objects all the time: software, poems, mistakes, triangles.. [Boolos]
Mathematics isn't surprising, given that we experience many objects as abstract [Boolos]
Infinite natural numbers is as obvious as infinite sentences in English [Boolos]
A few axioms of set theory 'force themselves on us', but most of them don't [Boolos]