Pillay's conjecture on almost quantifier elimination and largeness

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Let KK be a field. Say that KK has almost quantifier elimination if every formula ϕ(x)\phi(x), with x=(x1,…,xm)x=(x_1,\ldots,x_m), is equivalent to a formula ∃y θ(x,y)\exists y\,\theta(x,y), where y=(y1,…,yn)y=(y_1,\ldots,y_n), θ\theta is quantifier-free, possibly with parameters from KK, and for some kk one has

Kalg⊨∀x ∃≤ky θ(x,y).K^{\mathrm{alg}}\models\forall x\,\exists^{\leq k}y\,\theta(x,y).

Pillay's conjecture. If KK has almost quantifier elimination, then KK is large. Many familiar model-complete fields have almost quantifier elimination, including pseudofinite fields and fields that are algebraically, real, or pp-adically closed; whether the stated implication holds in general is open.

References

Primary source

Erik Walsberg and Jinhe Ye, “Éz fields”, arXiv:2103.06919 (2022).

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