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The tan (2THETA) Theorem for Indefinite Quadratic Forms (CROSBI ID 183941)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Grubišić, Luka ; Kostrykin, Vadim ; Makarov, Konstantin A. ; Veselić, Krešimir
The tan (2THETA) Theorem for Indefinite Quadratic Forms // Journal of Spectral Theory, 3 (2013), 1; 83-100. doi: 10.4171/JST/38
Podaci o odgovornosti
Grubišić, Luka ; Kostrykin, Vadim ; Makarov, Konstantin A. ; Veselić, Krešimir
engleski
The tan (2THETA) Theorem for Indefinite Quadratic Forms
A version of the Davis-Kahan tan(2 THETA) theorem [SIAM J. Numer. Anal. 7 (1970), 1 – 46] for not necessarily semibounded linear operators defined by quadratic forms is proven. This theorem generalizes a recent result by Motovilov and Selin [Integr. Equat. Oper. Theory 56 (2006), 511 – 542]
Perturbation theory ; quadratic forms ; invariant subspaces
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