The type-definable subgroup inclusion conjecture for group extensions

Let (G~,A,G)(\widetilde{G^*},A^*,G^*) be in Situation (0)(0), and let BB be the parameter set used to define the connected components. Suppose

GB000=GB00.{G^*}^{000}_B={G^*}^{00}_B.

Let HH be a BB-invariant subgroup of G~\widetilde{G^*} of bounded index such that HAH\cap A^* is type-definable. Type-definable subgroup inclusion conjecture. Then

G~B00AHA.\widetilde{G^*}^{00}_B\cap A^*\subseteq H\cap A^*.

This conjecture is stated as equivalent to the preceding conjecture and generalizes the nearby corollary; the supplied text gives no proof or disproof, so the assertion remains open.

Sources & referencesView supporting material

Primary source

Jakub Gismatullin and Krzysztof Krupinski, “On model-theoretic connected components in some group extensions”, arXiv:1201.5221 (2013).

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