Superlimit-or-maximal-nonstructure conjecture for abstract elementary classes

Let k{\mathfrak k} be an abstract elementary class and put κ=LSTk+τk\kappa={\rm LST}_{\mathfrak k}+|\tau_{\mathfrak k}|. Superlimit-or-nonstructure conjecture. At least one of the following holds: (a) whenever λ=1,λ>κ\lambda=\beth_{1,\lambda}>\kappa has cofinality 0\aleph_0, there is a nonempty family Υκsor[M,k]\Upsilon^{\rm sor}_\kappa[M,\mathfrak k]; or (b) whenever λ=1,λ>κ\lambda=\beth_{1,\lambda}>\kappa has cofinality 0\aleph_0, I˙(λ,Kk)=2λ\dot I(\lambda,K_{\mathfrak k})=2^\lambda. The source gives this as a concluding conjectural dichotomy, with no resolution stated.

Sources & referencesView supporting material

Primary source

Saharon Shelah, “A.E.C. with not too many models”, arXiv:1302.4841 (2013).

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