Hexality conjecture for swapped contact structures and Anosov flows

Suppose nx>0n_x>0, ny<0n_y<0, and nz>0n_z>0, and let Mnx,ny,nzM_{n_x,n_y,n_z} carry the Anosov flows ϕxy\phi_{xy} and ϕyz\phi_{yz} from the two surgery descriptions. A contact-structure swapping conjecture. There exist two positive contact structures ξx,ξz\xi_x,\xi_z and a negative contact structure ξy\xi_y on Mnx,ny,nzM_{n_x,n_y,n_z} such that ϕxy\phi_{xy} is isotopically equivalent to a Reeb flow of ξz\xi_z and is supported by (ξx,ξy)(\xi_x,\xi_y), while ϕyz\phi_{yz} is isotopically equivalent to a Reeb flow of ξx\xi_x and is supported by (ξz,ξy)(\xi_z,\xi_y). This combines the two symmetric Reeb-flow predictions and asserts that the Anosov flows and positive contact structures can be interchanged; it remains open.

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Primary source

Chi Cheuk Tsang, “Legendrian position of veering triangulations”, arXiv:2604.06690 (2026).

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