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- W4386148049 abstract "To apportion a complex matrix means to apply a similarity so that all entries of the resulting matrix have the same magnitude. We initiate the study of apportionment, both by unitary matrix similarity and general matrix similarity. There are connections between apportionment and classical graph decomposition problems, including graceful labelings of graphs, Hadamard matrices, and equiangluar lines, and potential applications to instantaneous uniform mixing in quantum walks. The connection between apportionment and graceful labelings allows the construction of apportionable matrices from trees and a generalization of the well-known Eigenvalue Interlacing Inequalities. It is shown that every rank one matrix can be apportioned by a unitary similarity, but there are $2times 2$ matrices that cannot be apportioned. A necessary condition for a matrix to be apportioned by unitary matrix is established. This condition is used to construct a set of matrices with nonzero Lebesgue measure that are not apportionable by a unitary matrix." @default.
- W4386148049 created "2023-08-25" @default.
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- W4386148049 date "2023-08-22" @default.
- W4386148049 modified "2023-10-16" @default.
- W4386148049 title "Apportionable matrices and gracefully labelled graphs" @default.
- W4386148049 doi "https://doi.org/10.48550/arxiv.2308.11808" @default.
- W4386148049 hasPublicationYear "2023" @default.
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