Adjunction conjecture for Chern classes of tropical manifolds

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Let XX be a pure-dimensional compact tropical manifold, and let DD be a tropical submanifold of codimension 11. Let ι ⁣:D→X\iota\colon D\to X be the inclusion, let csm(X)=∑k=0ncksm(X)c^{\mathrm{sm}}(X)=\sum_{k=0}^{n}c_k^{\mathrm{sm}}(X) denote the total Chern class defined from the Chern–Schwartz–MacPherson cycles, and let [D]PD[D]_{\mathrm{PD}} denote the Poincaré dual of DD.

Tropical Chern-class adjunction conjecture. For every k∈Z≥0k\in\mathbb{Z}_{\geq 0},

ι∗csm(X)=csm(D)(1+ι∗[D]PD),\iota^*c^{\mathrm{sm}}(X)=c^{\mathrm{sm}}(D)\bigl(1+\iota^*[D]_{\mathrm{PD}}\bigr), ι∗cksm(X)=cksm(D)+ck−1sm(D) ι∗[D]PD∈Hk,k(D;Z).\iota^*c_k^{\mathrm{sm}}(X)=c_k^{\mathrm{sm}}(D)+c_{k-1}^{\mathrm{sm}}(D)\,\iota^*[D]_{\mathrm{PD}}\in H^{k,k}(D;\mathbb{Z}).

This is the tropical analogue of the classical adjunction formula for total Chern classes of a smooth divisor. The source presents it as an expectation and gives no general proof, so it remains open.

References

Primary source

Yuki Tsutsui, “The complement of tropical curves in moderate position on tropical surfaces”, arXiv:2403.19576 (2024).

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