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

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Let RR be the real closed field under consideration, let XX and YY be affine RR-varieties, and let pi:X→Ypi:X\to Y be a morphism such that pi∗OXpi_*\mathcal{O}_X is a free OY\mathcal{O}_Y-module of finite rank. Suppose S⊆Y(R)S\subseteq Y(R) is a semi-algebraically connected semi-algebraic set on which Xy‾X_{\overline{y}} is invariant. Write π0−1(S)\pi_0^{-1}(S) for the relevant subset over SS. Generalized geometric-delineability conjecture. There are semi-algebraic continuous functions f1,…,fs:S→π0−1(S)f_1,\ldots,f_s:S\to \pi_0^{-1}(S) satisfying

π∘fi=id⁡S\pi\circ f_i=\operatorname{id}_S

such that π0−1(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.

References

Primary source

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

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