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Questions where the notion matrix has an important or crucial role (for the latter, note the tag matrix-theory for potential use). Matrices appear in various parts of mathematics, and this tag is typically combined with other tags to make the general subject clear, such as an appropriate top-level tag ra.rings-and-algebras, co.combinatorics, etc. and other tags that might be applicable. There are also several more specialized tags concerning matrices.
1
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Diagonalizing a Certain Real and Symmetric Toeplitz Matrix
This class of matrices may have additional nice properties. …
3
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Accepted
Matrices that are Hadamard products of $X$ and $X^{-T}$
There are some properties of this product in Horn and Johnson, "Topics in Matrix Analysis", Cambridge Univ Press 1991.