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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.

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There is an observation on the eigenvalues of the sum of a kind of special Hermitian matrice...

Suppose $A$ and $B$ belong to a kind of special hermitian matrices, which have the following properties: $A$ and $B$ contain only one negative eigenvalue. the negative eigenvalue and the second-largest …
Mecheal Baker's user avatar