The surgery formulation of the degree-one map conjecture

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Let M=W∪TVM=\mathcal{W}\cup_\mathcal{T}\mathcal{V}, where T=∂W=∂V=W∩V\mathcal{T}=\partial \mathcal{W}=\partial \mathcal{V}=\mathcal{W}\cap\mathcal{V} is a genus-gg surface. Let γ1,…,γg\gamma_1,\dots,\gamma_g be non-separating simple closed curves in T\mathcal{T} such that T−⋃i=1gγi\mathcal{T}-\bigcup_{i=1}^g\gamma_i is connected and each γi\gamma_i bounds a disjoint incompressible surface in W\mathcal{W}. The surgery formulation of the degree-one map conjecture. If NN is the closed 3-manifold obtained by replacing W\mathcal{W} with a genus-gg handlebody HH such that every γi\gamma_i bounds a disk in HH, then

g(M)≥g(N).g(M)\ge g(N).

This reformulation expresses the degree-one map question as a question about surgery on a 3-manifold with connected boundary; it remains open together with the general degree-one map conjecture.

References

Primary source

Tao Li, “Heegaard genus, degree-one maps, and amalgamation of 3-manifolds”, arXiv:2007.14534 (2022).

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