Universality of bounded extension realization spaces
For a finite point configuration and an integer , let be the set of point configurations such that every chirotope of size realizable on top of is realizable on top of . A primary basic semi-algebraic set is a semi-algebraic set defined by finitely many polynomial equalities and strict inequalities. Universality conjecture. For every and every primary basic semi-algebraic set , there exists a finite point configuration such that is stably equivalent to . 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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