Factorization conjecture for quasi-isometries through collapsing maps

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Let (X,dX)(X,d_X) and (Y,dY)(Y,d_Y) be metric spaces, and let a quasi-isometry mean a map satisfying the usual multiplicative and additive coarse bounds. A collapsing map is a map obtained by collapsing a subset via an equivalence relation, and a Lipschitz map is a map with a linear distance bound.

Factorization conjecture. Any quasi-isometry can be expressed as the composition of a collapsing map and Lipschitz map.

This conjecture proposes that quasi-isometries, including canonical examples such as the floor function, admit a factorization into elementary collapsing and Lipschitz operations. The source gives no resolution or further hypotheses.

References

Primary source

Josh Thompson and Davin Hemmila, “Collapsing Maps and Quasi-Isometries”, arXiv:2202.05915 (2022).

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