Difference between revisions of "Huge"

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{{DISPLAYTITLE: Huge cardinals, almost huge and superhuge cardinals}}
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{{DISPLAYTITLE: Huge cardinal}}
  
 
A cardinal $\kappa$ is ''huge'' with target $\lambda$ if there is an elementary embedding $j:V\to M$ with critical point $\kappa$ such that $j(\kappa)=\lambda$ and $M^\lambda\subset M$.  
 
A cardinal $\kappa$ is ''huge'' with target $\lambda$ if there is an elementary embedding $j:V\to M$ with critical point $\kappa$ such that $j(\kappa)=\lambda$ and $M^\lambda\subset M$.  

Revision as of 09:26, 30 December 2011


A cardinal $\kappa$ is huge with target $\lambda$ if there is an elementary embedding $j:V\to M$ with critical point $\kappa$ such that $j(\kappa)=\lambda$ and $M^\lambda\subset M$.


Almost huge

A cardinal $\kappa$ is almost huge with target $\lambda$ if there is an elementary embedding $j:V\to M$ with critical point $\kappa$ such that $j(\kappa)=\lambda$ and $M^{\lt\lambda}\subset M$.

Superhuge

A cardinal $\kappa$ is superhuge if it is huge with target $\lambda$ for unboundedly many cardinals $\lambda$.

n huge

A cardinal $\kappa$ is $n$-huge with target $\lambda$ if there is an elementary embedding $j:V\to M$ with critical point $\kappa$ such that $M^{\kappa_n}\subset M$, where $\kappa_0=\kappa$ and $k_{i+1}=j(\kappa_i)$. Thus, the $1$-huge cardinals are precisely the huge cardinals.


Super n huge

A cardinal $\kappa$ is super-$n$-huge if it is $n$-huge with target $\lambda$ for arbitrarily large cardinals $\lambda$.


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