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  1. Co-theory of sorted profinite groups for PAC structures.Daniel Max Hoffmann & Junguk Lee - 2023 - Journal of Mathematical Logic 23 (3).
    We achieve several results. First, we develop a variant of the theory of absolute Galois groups in the context of many sorted structures. Second, we provide a method for coding absolute Galois groups of structures, so they can be interpreted in some monster model with an additional predicate. Third, we prove the “Weak Independence Theorem” for pseudo-algebraically closed (PAC) substructures of an ambient structure with no finite cover property (nfcp) and the property [Formula: see text]. Fourth, we describe Kim-dividing in (...)
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  • Quantifier elimination on some pseudo-algebraically closed valued fields.Jizhan Hong - 2023 - Annals of Pure and Applied Logic 174 (1):103170.
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  • On the antichain tree property.JinHoo Ahn, Joonhee Kim & Junguk Lee - 2022 - Journal of Mathematical Logic 23 (2).
    In this paper, we investigate a new model theoretical tree property (TP), called the antichain tree property (ATP). We develop combinatorial techniques for ATP. First, we show that ATP is always witnessed by a formula in a single free variable, and for formulas, not having ATP is closed under disjunction. Second, we show the equivalence of ATP and [Formula: see text]-ATP, and provide a criterion for theories to have not ATP (being NATP). Using these combinatorial observations, we find algebraic examples (...)
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  • The Embedding Property for Sorted Profinite Groups.L. E. E. Junguk - 2023 - Journal of Symbolic Logic 88 (3):1005-1037.
    We study the embedding property in the category of sorted profinite groups. We introduce a notion of the sorted embedding property (SEP), analogous to the embedding property for profinite groups. We show that any sorted profinite group has a universal SEP-cover. Our proof gives an alternative proof for the existence of a universal embedding cover of a profinite group. Also our proof works for any full subcategory of the sorted profinite groups, which is closed under taking finite quotients, fibre products, (...)
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  • Elementary equivalence theorem for Pac structures.Jan Dobrowolski, Daniel Max Hoffmann & Junguk Lee - 2020 - Journal of Symbolic Logic 85 (4):1467-1498.
    We generalize a well-known theorem binding the elementary equivalence relation on the level of PAC fields and the isomorphism type of their absolute Galois groups. Our results concern two cases: saturated PAC structures and nonsaturated PAC structures.
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