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Minimal forbidden-minor conjecture for the sign pattern $s_*$
Let $\Sigma \in \operatorname{PR}_5$ be a real symmetric matrix whose principal-minor sign pattern $\operatorname{signs}_\Sigma$ agrees with $s_*$ on all subsets of sizes $1$ and…
openFrom papersprincipal-minors real-symmetric-matrices sign-patterns
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Minimal forbidden-minor conjecture for the sign pattern s∗s_*s∗​