1.lsthereasimplecandidatefortheaxiomⅤ=Ultimate-L”?
2.lsUltimate-Levenagoodpartial-extendermodel?
UniversallyBairesets
Definition(Feng-Magidoe-woodin)
AsetA⊆RisuniversallyBaireifforalltopologicalspacesΩandforallcontinuousfunctions:Ω→R.thepreimageofAbyπhasthepropertyofBaireinthespaceΩ.
⇨UniversallyBairesetsareanabstractgeneraliIationoftheborelsets.
Theorcm
SupposethatthereisaproperclassofwoodincardinalsandthatA⊆RisuniversallyBaire.Theneveryset
B∈L(A,R)∩Р(R)
isuniversallyBaire.
HODᴸ(ᴬᴿ)andlargecardinalaxioms
Definition
SupposethatA⊆RisuniversallyBaire.
ThenΘᴸ(ᴬᴿ)isthesupremumoftheordinalsαsuchthatthereisasurjection.π:R→α.suchthatπ∈L(A,R).
⇨Θᴸ(ᴬᴿ)isameasureofthecomplexityofA.
Relnrme
SupposethatthereisaproperclassofwoodincardinalsandthatAisuniversallyBaire.
ThenΘᴸ(ᴬᴿ)isawoodincardinalinHODᴸ(ᴬᴿ).
HODᴸ(ᴬᴿ)andthelnnerModelprogram
Theorcm(Steel)
Supposethatthereisaproperclassofwoodincardinalsandletδ=Θᴸ(ᴿ).
ThenHODᴸ(ᴿ)∩VδisaMitchell-Steelmodel.
Theorcm
Supposethatthereisaproperclassofwoodincardinals.
ThenHODᴸ(ᴿ)isnotaMitchell-Steelmodel.
Thereisanotherclassofsolutionstotheinnermodelproblemforlargecardinals.
⇨strategicpartial-extendermodels
⇨previouslyuhknown.
TheaxiomforV=Ultimate-L
(meta)Conjecture:TheaxiomforV=Ultimate-L
⇨Thereisastrongcardinalandaproperclassofwoodincardinals.
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