The topology conjecture for proper dp-minimal expansions of (Z,+)(\mathbb{Z},+)

Let Z{\mathscr{Z}} be an expansion of (Z,+)(\mathbb{Z},+), and say that it is proper if it is not interdefinable with (Z,+)(\mathbb{Z},+). Say that Z{\mathscr{Z}} eliminates \exists^\infty if, uniformly in parameters, it cannot define finite sets of arbitrarily large cardinality. A group topology on (Z,+)(\mathbb{Z},+) is non-discrete if the singleton topology is not the topology in question.

Topology conjecture. Any proper dp-minimal expansion of (Z,+)(\mathbb{Z},+) which eliminates \exists^\infty defines a non-discrete group topology on (Z,+)(\mathbb{Z},+).

The conjecture proposes that all proper dp-minimal expansions with this finiteness property arise from a non-discrete group topology, complementing the known result that expansions failing to eliminate \exists^\infty define the order <<.

Sources & referencesView supporting material

Primary source

Erik Walsberg, “Dp-minimal expansions of (Z,+) via dense pairs via Mordell-Lang”, arXiv:2004.06847 (2020).

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