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Zapiski Nauchnykh Seminarov POMI, 2003, Volume 301, Pages 172–194 (Mi znsl952)  

This article is cited in 2 scientific papers (total in 2 papers)

Bounds for the extreme eigenvalues of block $2\times2$ Hermitian matrices

L. Yu. Kolotilina

St. Petersburg Department of V. A. Steklov Institute of Mathematics, Russian Academy of Sciences
Full-text PDF (228 kB) Citations (2)
References:
Abstract: Let an $n\times n$ Hermitian matrix $A$ be presented in block $2\times2$ form as $A=\left[\begin{smallmatrix}A_{11}&A_{12}\\A^*_{12}&A_{22}\end{smallmatrix}\right]$, where $A_{12}\ne0$, and assume that the diagonal blocks $A_{11}$ and $A_{22}$ are positive definite. Under these assumptions, it is proved that the extreme eigenvalues of $A$ satisfy the bounds
$$ \lambda_1(A)\ge\|A_{12}\|(\|R\|^{-1}+1),\quad |\lambda_n(A)|\le\|A_{12}\|\,\bigl|\,\|R\|^{-1}-1\bigr|, $$
where $R=A^{-1/2}_{11}A_{12}A^{-1/2}_{22}$ and $\|\cdot\|$ is the spectral norm. Further, in the positive-definite case, several equivalent conditions necessary and sufficient for both of the above bounds to be attained are provided.
Received: 11.09.2003
English version:
Journal of Mathematical Sciences (New York), 2005, Volume 129, Issue 2, Pages 3772–3786
DOI: https://doi.org/10.1007/s10958-005-0312-y
Bibliographic databases:
UDC: 512.643.5
Language: Russian
Citation: L. Yu. Kolotilina, “Bounds for the extreme eigenvalues of block $2\times2$ Hermitian matrices”, Representation theory, dynamical systems, combinatorial and algoritmic methods. Part IX, Zap. Nauchn. Sem. POMI, 301, POMI, St. Petersburg, 2003, 172–194; J. Math. Sci. (N. Y.), 129:2 (2005), 3772–3786
Citation in format AMSBIB
\Bibitem{Kol03}
\by L.~Yu.~Kolotilina
\paper Bounds for the extreme eigenvalues of block~$2\times2$ Hermitian matrices
\inbook Representation theory, dynamical systems, combinatorial and algoritmic methods. Part~IX
\serial Zap. Nauchn. Sem. POMI
\yr 2003
\vol 301
\pages 172--194
\publ POMI
\publaddr St.~Petersburg
\mathnet{http://mi.mathnet.ru/znsl952}
\mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=2032054}
\zmath{https://zbmath.org/?q=an:1146.15009}
\transl
\jour J. Math. Sci. (N. Y.)
\yr 2005
\vol 129
\issue 2
\pages 3772--3786
\crossref{https://doi.org/10.1007/s10958-005-0312-y}
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  • This publication is cited in the following 2 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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