Extension of an independence relation to the lovely-pair structure
Let be the monster structure, let be the distinguished predicate defining the lovely-pair structure , 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 .
Extension conjecture for lovely pairs. There exists an independence relation mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{2}}\,\,\,\,}} on such that:
- mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{2}}\,\,\,\,}} coincides with mathop{\mathpalette\Ind{}^{\!\!\!\!\rlap{\scriptscriptstyle\textnormal{}}\,\,\,\,}} on subsets of ;
- 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 , 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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