Extension of an independence relation to the lovely-pair structure

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Let C\mathfrak C be the monster structure, let P⊆CP\subseteq\mathfrak C be the distinguished predicate defining the lovely-pair structure CP\mathfrak C_P, and let mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{}}\,\,\,\,}} be the given independence relation. Write mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{}}\,\,\,\,}}_P for its localization over PP.

Extension conjecture for lovely pairs. There exists an independence relation mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{2}}\,\,\,\,}} on CP\mathfrak C_P such that:

  1. mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{2}}\,\,\,\,}} coincides with mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{}}\,\,\,\,}} on subsets of PP;
  2. mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{2}}\,\,\,\,}}_P=mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{}}\,\,\,\,}}_P.

The proposition immediately before the candidate shows that the localized relation mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{}}\,\,\,\,}}_P is already an independence relation on CP\mathfrak C_P, with the same local-character constant, and preserves property (*). Thus the conjectural extension is closely related to the localization construction, but the stated existence claim itself should be checked against that proposition.

References

Primary source

Antongiulio Fornasiero, “Lovely pairs for independence relations”, arXiv:1009.5244 (2010).

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