Geodesic
Absolutely flat idempotents
The electronic journal of linear algebra, Tome 10 (2003), pp. 190-200.

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

Summary: A real n-by-n idempotent matrix A with all entries having the same absolute value is called absolutely flat. The possible ranks of such matrices are considered along with a characterization of the triples: size, constant, and rank for which such a matrix exists. Possible inequivalent examples of such matrices are also discussed.
Classification : 15A21, 15A24, 05A15, 46B20
Keywords: idempotent matrix, absolutely flat, projection 
@article{ELA_2003__10__a10,
     author = {Johnson, Charles R. and Harel, Yonatan and Hillar, Christopher J. and Groves, Jonathan M. and Rault, Patrick X.},
     title = {Absolutely flat idempotents},
     journal = {The electronic journal of linear algebra},
     pages = {190--200},
     publisher = {mathdoc},
     volume = {10},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2003__10__a10/}
}
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Johnson, Charles R.; Harel, Yonatan; Hillar, Christopher J.; Groves, Jonathan M.; Rault, Patrick X. Absolutely flat idempotents. The electronic journal of linear algebra, Tome 10 (2003), pp. 190-200. http://geodesic.mathdoc.fr/item/ELA_2003__10__a10/