η<α.if
X≺(Lα[E].E∩Lα[E])
istheelementarysubstructuregivenbytheelementswhicharedeflnablewithparametensfromηthen.
Χ≅(Lᵦ[E].E∩Lᵦ[E])
for some β.
⇨lfL[E]isagoodpartial-extendermodelthenthecontinuumHypothesisholdsinL[E].
Mitchell-Steelmodels
⇨Thebasicframewcrkforgoodpartial-extendersmodelsforlargecardinalsuptothelevelofsuperstrongcardinalsoriginatesintheconstuctionsofMitchellandSteel.
⇨ThereisanimportantvaiationduetoJensenwhichisequivalentbutyiekjsmodelswithstrongercondensationproperties.
Theeorem(MitchellSteeletal)
Assumethereisaproperclassofwoodincardinals.Thenthereisapartial-extendermodelL[E]foraproperclassofwoodincardinalssachthat
(1)Eisweakly∑₂-definable.
(2)L[E]isagoodpartial-extendermodel.
Theorem(Mitchell-Steeletal)
AssumetheltenationHypothesisandthatthereisaproperclassofsuperstrongcardinals.Thenthereisapartial-extendermodelL[E]foraproperclassofsuperstrongcardinalssuchthat
(1)Eisweakly∑₂-definable。
(2)L[E]isagoodpartial-extendermodel.
Conjecture
AssumethelterationHypothesisandthatthereisanextendibiecardinal.Thenthereisapartial-extendermodelL[E]forasupercompactcardinalsuchthat
(1)Eisweakly∑₂-definable.
(2)L[E]isagoodpartial-extendermodel.
Afirststep
Theorem
AssumethereisasupercompactcardinalandthatthelterationHypothesisholds.Thenthereisapartial-extendermodelL[E]suchthat
(1)Eisweakly∑₂-deflnable。
(2)L[E]isagoodpartial-extendermodel.
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