Weiwei Wu

collaborators

3 papers

math.GT2026

Dax invariants, light bulbs, and isotopies of symplectic structures

Jianfeng Lin, Weiwei Wu, Yi Xie +1

This paper addresses several isotopy problems on $4$ -manifolds. First, we classify the isotopy classes of embeddings of $I^£$ in $I^£ \times S^{2}$ that are geometrically dual to $\{\mb…

math.SG2025

$C^{0}$ -rigidity of the Hamiltonian diffeomorphism group of symplectic rational surfaces

Marcelo Atallah, Cheuk Yu Mak, Weiwei Wu

We investigate the $C^{0}$ -topology of the group of symplectic diffeomorphisms of positive symplectic rational surfaces. For all but a few exceptions, we prove that the group of Hami…

math.SG2025

Infinite connected components of the space of symplectic forms on ruled surfaces

Jianfeng Lin, Weiwei Wu

We provide an infinite family of diffeomorphic symplectic forms on ruled surfaces, which are pairwise non-isotopic. This answers a uniqueness question regarding symplectic structur…

Dax invariants, light bulbs, and isotopies of symplectic structures

C0-rigidity of the Hamiltonian diffeomorphism group of symplectic rational surfaces

Infinite connected components of the space of symplectic forms on ruled surfaces

$C^{0}$ -rigidity of the Hamiltonian diffeomorphism group of symplectic rational surfaces