Sylvester's Law Of Inertia

In linear algebra, Sylvester's law of inertia states that the inertia of a matrix A is invariant under congruence transformations. It is named for J. J. Sylvester. The inertia of A is defined as the triple containing the numbers of positive, negative and zero eigenvalues of A: see also signature (quadratic form). A congruence transformation of A is formed as the product
SAS^T
where S is any given non-singular matrix. In other words, the signature of A as quadratic form is well-defined and independent of change of basis.

 

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