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Results tagged with matrices
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user 140320
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 the solution of this linear system always positive definite?
I think the answer is yes. Write $$P^\mathrm{t}(J_n \circ PSP^\mathrm{t})P=P^\mathrm{t}(PSP^\mathrm{t}-I_n\circ PSP^\mathrm{t})P=S-P^\mathrm{t}(I_n \circ PSP^\mathrm{t})P$$
so the solution satisfies
$ …
