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math.LO2026
Open Problems in Mathematical Logic
George Barmpalias, Su Gao, Jialiang He +8
These open problems were presented in the Problem Sessions held during the Tianyuan Workshop on Definability and Computation, June 22-26, 2026. The problems are organized into sect…
math.LO2026
Hyperarithmetic directions can all be exceptional for Marstrand's projection theorem
Noam Greenberg, Daniel Turetsky
We show that there is a subset of the Euclidean plane, of Hausdorff dimension 1, such that for every line through the origin with hyperarithmetic direction, the…