Woodin cardinal

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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

j(κ)MM.

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 jn(κ).

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

<jn(κ)MM.

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

<jn(κ)MM.

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

jn(κ)MM.

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

jn(κ)MM.

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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