Istituto di Scienza e Tecnologie dell'Informazione     
Codenotti B., Romani F. A note on the quadrant interlocking factorization. Internal note IEI-B4-42, 1988.
It was recently shown that the Quadrant Interlocking Factorization (QIF) techniques proposed by D.J. Evans and several co-workers are equivalent to block-LU factorization, with the exception of centrosymmentric matrices. In this work the complete equivalence between Quadrant Interlocking and LU factorization techniques is proved for centrosymmentric matrices as well. As a consequence all the questions addressed on the CIF can be stated in terms of

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