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math.CA2026
Sets with no Riesz bases of exponentials
Zhiqiang Wan
We prove that sets in a certain class do not admit Riesz bases of exponentials. In particular, this class contains disks and triangles in the plane.
math.CA2026
Heisenberg Uniqueness Pairs for a Hyperbola Branch: Supercritical Nonuniqueness for Shifted Lattice Crosses
Zhiqiang Wan
We study Heisenberg uniqueness for the positive hyperbola branch and shifted lattice crosses in the supercritical regime . We resolve the infinite-dimensionality clause of…