Five equivalent characterizations of strong Δ-matroids are given, including novel peerless and isolated antipode conditions that yield new local exchange axioms, motivated by tropical equations from the orthogonal Grassmannian.
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Characterisations of strong $\Delta$-matroids
Five equivalent characterizations of strong Δ-matroids are given, including novel peerless and isolated antipode conditions that yield new local exchange axioms, motivated by tropical equations from the orthogonal Grassmannian.