Prove or refute the Church–Turing thesis
Establish whether the Church–Turing thesis holds; specifically, determine whether every effectively computable method can be computed by a Turing machine, or provide a counterexample that refutes the thesis.
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References
Even though the Church-Turing thesis remains a conjecture, it still forms the basis of modern computer science.
— On the Computability of Artificial General Intelligence
(2512.05212 - Mappouras et al., 4 Dec 2025) in Section 2.1 (Computability and the Church-Turing Thesis)