The connected-component inclusion conjecture for group extensions

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Let (G∗~,A∗,G∗)(\widetilde{G^*},A^*,G^*) be in Situation (00)(00), and let BB be the parameter set used to define the connected components. Suppose

G∗B000=G∗B00.{G^*}^{000}_B={G^*}^{00}_B.

Connected-component inclusion conjecture. Then

G∗~B00∩A∗⊆A1∗  ⟺  G∗~B000∩A∗⊆A1∗.\widetilde{G^*}^{00}_B\cap A^*\subseteq A^*_1\iff \widetilde{G^*}^{000}_B\cap A^*\subseteq A^*_1.

This is presented as an equivalent reformulation of the subsequent conjecture and is stated without a resolution; the paper notes that related implications are known under additional hypotheses, including countability and A1∗⊆G∗~B000∩A∗A^*_1\subseteq\widetilde{G^*}^{000}_B\cap A^*, while the unrestricted form remains open.

References

Primary source

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

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