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math.AT2026
Cusp restrictions and Bunke--Naumann invariants with level structure
Yuqi Li, Hao-Yu Sun
Restriction to the full cusp divisor of a modular curve defines a secondary invariant whose rational indeterminacy comes from a single global modular form. For every integral weakl…
math.AT2026
The hyperbolic class and vanishing laws in a TMF-valued four-manifold invariant
Yuqi Li, Hao-Yu Sun
Under explicit hypotheses on the spectral Looijenga construction, we compute the hyperbolic-plane value of the zero-section invariant of Gukov, Krushkal, Meier, and Pei in periodic…