Universality of bounded extension realization spaces

For a finite point configuration P⊂RdP\subset\mathbb{R}^d and an integer k≥0k\geq 0, let [P]k[P]_k be the set of point configurations Q∈(Rd)XQ\in(\mathbb{R}^d)^X such that every chirotope of size ∣X∣+k|X|+k realizable on top of PP is realizable on top of QQ. A primary basic semi-algebraic set is a semi-algebraic set defined by finitely many polynomial equalities and strict inequalities. Universality conjecture. For every 0≤k<∞0\leq k<\infty and every primary basic semi-algebraic set SS, there exists a finite point configuration P⊂R2P\subset\mathbb{R}^2 such that [P]k[P]_k is stably equivalent to SS. This conjecture asks whether universality still holds when realizations are restricted by extensions of bounded size; it would contrast with the rigidity obtained when all extensions are considered. The supplied text gives no resolution status.

References

Primary source

Xavier Goaoc and Arnau Padrol, “An asymptotic rigidity property from the realizability of chirotope extensions”, arXiv:2505.14189 (2025).

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