The tropical generation conjecture for Lagrangian cobordism of bielliptic surfaces

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Let K\mathcal K denote the symplectic bielliptic surface, and let Cob⁡trop(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

Cob⁡trop(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.

References

Primary source

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

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