Schur complements and state space realizations
Linear Algebra and Its Applications , Volume 399 - Issue 1-3 p. 203- 224
Motivated by state space realizations of transfer functions from system theory, a number of operations on Schur complements are introduced and studied. These operations are equivalence, extension, multiplication, inversion, and factorization. Together they form an algebraic framework which is of independent interest, and also useful in solving problems in analysis.
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Bart, H, Gohberg, I, Kaashoek, J.F, & Ran, L. (2005). Schur complements and state space realizations. In Linear Algebra and Its Applications (Vol. 399, pp. 203–224). doi:10.1016/j.laa.2004.10.027