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math.SG2024
A note on the symplectic classification of almost-toric systems
Xiudi Tang
Since simple semitoric systems were classified about fifteen years ago, and semitoric systems five years ago, we want to move a step forward to almost-toric systems. We give a clas…
math.SG2024
Classifying affine structures with focus-focus singularities
Xiudi Tang
We study the singular affine structures of integrable systems with focus-focus singular fibers on the image of momentum maps. The classification of singular affine structures is eq…