Generalization of geometric delineability without the relative-dimension-one condition

Let RR be the real closed field under consideration, let XX and YY be affine RR-varieties, and let pi:XYpi:X\to Y be a morphism such that piOXpi_*\mathcal{O}_X is a free OY\mathcal{O}_Y-module of finite rank. Suppose SY(R)S\subseteq Y(R) is a semi-algebraically connected semi-algebraic set on which XyX_{\overline{y}} is invariant. Write π01(S)\pi_0^{-1}(S) for the relevant subset over SS. Generalized geometric-delineability conjecture. There are semi-algebraic continuous functions f1,,fs:Sπ01(S)f_1,\ldots,f_s:S\to \pi_0^{-1}(S) satisfying

πfi=idS\pi\circ f_i=\operatorname{id}_S

such that π01(S)\pi_0^{-1}(S) is covered by the images of f1,,fsf_1,\ldots,f_s. This conjecture asserts that the geometric-delineability theorem remains valid without the Projection of Relative Dimension 1 condition.

Sources & referencesView supporting material

Primary source

Rizeng Chen, “A Geometric Approach to Cylindrical Algebraic Decomposition”, arXiv:2311.10515 (2025).

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