The tropical generation conjecture for Lagrangian cobordism of bielliptic surfaces

Let K\mathcal K denote the symplectic bielliptic surface, and let Cobtrop(K)\operatorname{Cob}^{trop}(\mathcal K) be the subgroup of the Lagrangian cobordism group Cob(K)\operatorname{Cob}(\mathcal K) generated by tropical Lagrangians. Tropical generation conjecture. The inclusion

Cobtrop(K)Cob(K)\operatorname{Cob}^{trop}(\mathcal K) \hookrightarrow \operatorname{Cob}(\mathcal K)

is an isomorphism. This would show that every Lagrangian cobordism class on a symplectic bielliptic surface is represented by the tropical Lagrangians considered in the paper; the preceding theorem establishes the analogous isomorphism from the tropical subgroup to the relevant Grothendieck group, but does not establish that the full cobordism group is generated tropically.

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Primary source

Álvaro Muñiz-Brea, “Lagrangian cobordisms and K-theory of symplectic bielliptic surfaces”, arXiv:2403.17098 (2024).

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