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Lower semicontinuity of positive quadratic forms. (English) Zbl 0442.47017


MSC:

47B25 Linear symmetric and selfadjoint operators (unbounded)
47A55 Perturbation theory of linear operators
15A63 Quadratic and bilinear forms, inner products
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References:

[1] Reed, Methods of Modern Mathematical Physics. I. Functional Analysis (1972) · Zbl 0242.46001
[2] DOI: 10.1007/BF01609845 · doi:10.1007/BF01609845
[3] Brezis, Maximal Monotone Operators (1973)
[4] Kato, Perturbation Theory for Linear Operators (1966) · Zbl 0148.12601
[5] Dym, Fourier Series and Integrals (1972)
[6] DOI: 10.1016/0001-8708(77)90108-6 · Zbl 0938.81568 · doi:10.1016/0001-8708(77)90108-6
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