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In [[mathematics]], a [[cardinal number]] κ is called '''huge''' if [[there exists]] an [[elementary embedding]] ''j'' : ''V'' → ''M'' from ''V'' into a transitive [[inner model]] ''M'' with [[critical point (set theory)|critical point]] κ and


:<math>{}^{j(\kappa)}M \subset M.\!</math>


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Here, ''<sup>&alpha;</sup>M'' is the class of all [[sequence]]s of length α whose elements are in M.
 
Huge cardinals were introduced by {{harvs|txt|authorlink=Kenneth Kunen|first=Kenneth |last=Kunen|year=1978}}.
 
== Variants ==
In what follows, j<sup>''n''</sup> refers to the ''n''-th iterate of the elementary embedding j, that is, j [[function composition|composed]] with itself ''n'' times, for a finite ordinal ''n''. Also, ''<sup>&lt;&alpha;</sup>M'' is the class of all sequences of length less than α whose elements are in M. Notice that for the "super" versions, γ should be less than j(κ), not <math>{j^n(\kappa)}</math>. 
 
κ is '''almost n-huge''' if and only if there is ''j'' : ''V'' → ''M'' with critical point κ and
 
:<math>{}^{<j^n(\kappa)}M \subset M.\!</math>
 
κ is '''super almost n-huge''' if and only if for every ordinal γ there is ''j'' : ''V'' → ''M'' with critical point κ, γ&lt;j(κ), and
 
:<math>{}^{<j^n(\kappa)}M \subset M.\!</math>
 
κ is '''n-huge''' if and only if there is ''j'' : ''V'' → ''M'' with critical point κ and
 
:<math>{}^{j^n(\kappa)}M \subset M.\!</math>
 
κ is '''super n-huge''' if and only if for every ordinal γ there is ''j'' : ''V'' → ''M'' with critical point κ, γ&lt;j(κ), and  
 
:<math>{}^{j^n(\kappa)}M \subset M.\!</math>
 
Notice that 0-huge is the same as [[measurable cardinal]]; and 1-huge is the same as huge. A cardinal satisfying one of the [[rank into rank]] axioms is ''n''-huge for all finite ''n''.  
 
The existence of an almost huge cardinal implies that [[Vopenka's principle]] is consistent; more precisely any almost huge cardinal is also a [[Vopenka cardinal]].
 
== Consistency strength ==
The cardinals are arranged in order of increasing consistency strength as follows:
*almost ''n''-huge
*super almost ''n''-huge
*''n''-huge
*super ''n''-huge
*almost ''n''+1-huge
The consistency of a huge cardinal implies the consistency of a [[supercompact cardinal]], nevertheless, the least huge cardinal is smaller than the least supercompact cardinal (assuming both exist).
 
==ω-huge cardinals==
One can try defining an ω-huge cardinal κ as one such that an elementary embedding j : V → M from V into a transitive inner model M with critical point κ and <sup>λ</sup>''M''⊆''M'', where λ is the supremum of ''j''<sup>''n''</sup>(κ) for positive integers ''n''. However [[Kunen's inconsistency theorem]] shows that ω-huge cardinals are inconsistent in ZFC, though it is still open whether they are consistent in ZF.
 
== See also ==
 
*[[List of large cardinal properties]]
*The [[Dehornoy order]] on a braid group was motivated by properties of huge cardinals.
 
== References ==
*{{Citation | last1=Kunen | first1=Kenneth | author1-link=Kenneth Kunen | title=Saturated ideals | doi=10.2307/2271949 | mr=495118 | year=1978 | journal=The Journal of Symbolic Logic | issn=0022-4812 | volume=43 | issue=1 | pages=65–76}}
* Penelope Maddy,"Believing the Axioms,II"(i.e. part 2 of 2),"Journal of Symbolic Logic",vol.53,no.3,Sept.1988,pages 736 to 764 (esp.754-756).
* {{cite book|last=Kanamori|first=Akihiro|year=2003|publisher=Springer|title=The Higher Infinite : Large Cardinals in Set Theory from Their Beginnings|edition=2nd ed|isbn=3-540-00384-3}}
 
[[Category:Large cardinals]]

Revision as of 22:19, 31 January 2014

In mathematics, a cardinal number κ is called huge if there exists an elementary embedding j : VM from V into a transitive inner model M with critical point κ and

Here, αM is the class of all sequences of length α whose elements are in M.

Huge cardinals were introduced by Template:Harvs.

Variants

In what follows, jn refers to the n-th iterate of the elementary embedding j, that is, j composed with itself n times, for a finite ordinal n. Also, M is the class of all sequences of length less than α whose elements are in M. Notice that for the "super" versions, γ should be less than j(κ), not .

κ is almost n-huge if and only if there is j : VM with critical point κ and

κ is super almost n-huge if and only if for every ordinal γ there is j : VM with critical point κ, γ<j(κ), and

κ is n-huge if and only if there is j : VM with critical point κ and

κ is super n-huge if and only if for every ordinal γ there is j : VM with critical point κ, γ<j(κ), and

Notice that 0-huge is the same as measurable cardinal; and 1-huge is the same as huge. A cardinal satisfying one of the rank into rank axioms is n-huge for all finite n.

The existence of an almost huge cardinal implies that Vopenka's principle is consistent; more precisely any almost huge cardinal is also a Vopenka cardinal.

Consistency strength

The cardinals are arranged in order of increasing consistency strength as follows:

  • almost n-huge
  • super almost n-huge
  • n-huge
  • super n-huge
  • almost n+1-huge

The consistency of a huge cardinal implies the consistency of a supercompact cardinal, nevertheless, the least huge cardinal is smaller than the least supercompact cardinal (assuming both exist).

ω-huge cardinals

One can try defining an ω-huge cardinal κ as one such that an elementary embedding j : V → M from V into a transitive inner model M with critical point κ and λMM, where λ is the supremum of jn(κ) for positive integers n. However Kunen's inconsistency theorem shows that ω-huge cardinals are inconsistent in ZFC, though it is still open whether they are consistent in ZF.

See also

References

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  • Penelope Maddy,"Believing the Axioms,II"(i.e. part 2 of 2),"Journal of Symbolic Logic",vol.53,no.3,Sept.1988,pages 736 to 764 (esp.754-756).
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