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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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Is there a standard notation for off-diagonal transpose?

In http://arxiv.org/abs/math/0701936 (Fuchsian equations of type DN, by Vasily Golyshev and Jan Stienstra) the transpose of the matrix $A$ with respect to the anti-diagonal is denoted by $A^\tau$. It …
Zurab Silagadze's user avatar
4 votes

Origins of the Jacobi matrix

Perhaps this was a starting point of the theory of tridiagonal (Jacobi) matrices. … Some historically important references about the spectral theory of Jacobi operators can be found in http://annals.math.princeton.edu/wp-content/uploads/annals-v158-n1-p05.pdf (Sum rules for Jacobi matrices
Zurab Silagadze's user avatar