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Plus ultra
Frank Olaf Wagner 1
(20/01/2012)

We develop some basic simplicity-theoretic facts for quasi-finitary ultraimaginaries, i.e.\ classes of finite tuples modulo $\emptyset$-invariant equivalence relations, in a supersimple theory. We also show that they are geometrically eliminable in a weak sense: If $e$ is an ultraimaginary definable over a tupe $a$ with $SU(a)<\omega^{\alpha+1}$, then $e$ is eliminable up to rank $<\omega^alpha$. Finally, we show some uniform versions of the weak canonical base property.
1 :  Institut Camille Jordan (ICJ)
CNRS : UMR5208 – Université Claude Bernard - Lyon I – Ecole Centrale de Lyon – Institut National des Sciences Appliquées (INSA) - Lyon
AGL
Mathématiques/Logique
stability theory – simplicity theory – ultraimaginary – elimination – weak canonical base property
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