 Haynsworth inertia additivity formula (source code)

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= Haynsworth inertia additivity formula
{wiki=Haynsworth_inertia_additivity_formula}

Haynsworth's inertia additivity formula provides a way to compute the inertia (the number of positive, negative, and zero eigenvalues) of a block matrix based on the inertia of its individual blocks and their interactions.

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