Geodesic
Focal power
The electronic journal of linear algebra, Tome 13 (2005), pp. 56-71.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: The properties of a 2 * 2 block matrix M over a field for which (Mk)11 = (M)k11 are examined. This "fire-wall" property will be characterized by the vanishing of the sequence of moments Fi = CDiB.
Classification : 15A24, 15A09, 15A57
Keywords: matrix powers, polynomials, (1, 1) blocks 
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     author = {Hartwig, Robert E. and Maroulas, John},
     title = {Focal power},
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Hartwig, Robert E.; Maroulas, John. Focal power. The electronic journal of linear algebra, Tome 13 (2005), pp. 56-71. http://geodesic.mathdoc.fr/item/ELA_2005__13__a21/