On the inertia sets of some symmetric sign patterns
Czechoslovak Mathematical Journal, Tome 56 (2006) no. 3, pp. 875-883.

Voir la notice de l'article dans Czech Digital Mathematics Library

A matrix whose entries consist of elements from the set $\lbrace +,-,0\rbrace $ is a sign pattern matrix. Using a linear algebra theoretical approach we generalize of some recent results due to Hall, Li and others involving the inertia of symmetric tridiagonal sign matrices.
Classification : 15A18, 15A36, 15A48
Mots-clés : inertia; sign pattern matrix; tridiagonal matrix 
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Fonseca, C. M. da. On the inertia sets of some symmetric sign patterns. Czechoslovak Mathematical Journal, Tome 56 (2006) no. 3, pp. 875-883. https://geodesic-test.mathdoc.fr/item/CMJ_2006__56_3_a5/