The matroid rank conjecture for Hadamard products of linear spaces

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Let L1,…,Ld⊆REL_1,\dots,L_d \subseteq \mathbb{R}^E be finite-dimensional linear spaces, and let M1,…,MdM_1,\dots,M_d be their algebraic matroids. Write rMir_{M_i} for the rank function of MiM_i, and let ⋆\star denote the Hadamard product of linear spaces. Hadamard-product matroid conjecture.

M(L1⋆⋯⋆Ld)=M(rM1+⋯+rMd−d+1).\mathcal{M}(L_1\star\dots\star L_d)=\mathcal{M}(r_{M_1}+\dots+r_{M_d}-d+1).

This conjecture would generalize the preceding theorem from Hadamard products of two linear spaces to products of an arbitrary finite number of linear spaces. The source does not state a resolution, so the conjecture remains open.

References

Primary source

Daniel Irving Bernstein, “Generic symmetry-forced infinitesimal rigidity: translations and rotations”, arXiv:2003.10529 (2021).

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