The omega-categoricity conjecture for second-order strongly minimal sets

Let X\mathcal{X} be a strongly minimal set of differential order 22 definable over the field of constants C\mathcal{C}. A set is ω\omega-categorical if, for every non-constant solution xXx\in\mathcal{X}, the set CxalgX\mathcal{C}\langle x\rangle^{\mathrm{alg}}\cap\mathcal{X} is finite. For distinct non-constant solutions x1,,xnx_1,\ldots,x_n satisfying

tr.degCCx1,,xn=2n,\operatorname{tr.deg}_{\mathcal{C}}\mathcal{C}\langle x_1,\ldots,x_n\rangle=2n,

The ω\omega-categoricity conjecture. The set X\mathcal{X} is ω\omega-categorical if and only if there is a positive integer kk such that, for every such tuple x1,,xnx_1,\ldots,x_n, all but knkn other non-constant solutions xx satisfy

tr.degCCx1,,xn,x=2n+2.\operatorname{tr.deg}_{\mathcal{C}}\mathcal{C}\langle x_1,\ldots,x_n,x\rangle=2n+2.

This conjecture concerns the proposed characterization of finite algebraic dependence among solutions of second-order strongly minimal differential equations. In the stated source, the general conjecture is disproved by a counterexample of Freitag and Scanlon arising from the third-order differential equation satisfied by the jj-function.

Sources & referencesView supporting material

Primary source

Yutong Duan and Joel Nagloo, “Algebraic independence of the solutions of the classical Lotka-Volterra system”, arXiv:2502.17194 (2025).

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