Positive definiteness of tridiagonal matrices via the numerical range.
Chien, Mao-Ting ; Neumann, Michel
ELA. The Electronic Journal of Linear Algebra [electronic only], Tome 4 (1998), p. 93-102 / Harvested from The Electronic Library of Mathematics
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Publié le : 1998-01-01
EUDML-ID : urn:eudml:doc:119559 
@article{01158765,
     title = {Positive definiteness of tridiagonal matrices via the numerical range.},
     journal = {ELA. The Electronic Journal of Linear Algebra [electronic only]},
     volume = {4},
     year = {1998},
     pages = {93-102},
     zbl = {0896.15013},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01158765}
}

Chien, Mao-Ting; Neumann, Michel. Positive definiteness of tridiagonal matrices via the numerical range.. ELA. The Electronic Journal of Linear Algebra [electronic only], Tome 4 (1998) pp. 93-102. http://gdmltest.u-ga.fr/item/01158765/