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The Tropical Variety of Symmetric Rank 2 Matrices

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arxiv 2404.08121 v2 pith:PAWELE4G submitted 2024-04-11 math.CO math.AG

classification math.COmath.AG
keywords symmetricmatricesrankbicoloredcomplexsimplicialspacetrees
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We study the tropicalization of the variety of symmetric rank two matrices. Analogously to the result of Markwig and Yu for general tropical rank two matrices, we show that it has a simplicial complex structure as the space of symmetric bicolored trees and that this simplicial complex is shellable. We also discuss some matroid structures arising from this space and present generating functions for the number of symmetric bicolored trees.

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