Homotopy-equivalent topological representations detect isomorphisms of matroids

About 15 years old · traced to

Let XX be a finite CW complex that is not contractible, and let (M,l)(M,l) and (N,l′)(N,l') be ρ\rho-immersed matroids such that

TX(M,l)≃TX(N,l′).{ \mathscr T}_X(M,l) \simeq {\mathscr T}_X(N,l').

Suppose there exists a surjective weak map τ:M→N\tau:M\to N. Topological representation isomorphism conjecture. Then τ#\tau^{\#} is an isomorphism.

This conjecture proposes that, for a noncontractible base complex, homotopy equivalence of the associated topological representations forces the induced map on the relevant matroid data to be an isomorphism. The surrounding results establish strict Betti-number inequalities under rank-decreasing surjective weak maps, but the stated implication is not resolved here.

References

Primary source

Matthew T. Stamps, “Topological representations of matroid maps”, arXiv:1104.4152 (2012).

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