Spectral analysis of linear relations and degenerate operator semigroups

By A. Baskakov, K. Chernyshov. 2002

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Ascent, descent, nullity, defect, and related notions for linear relations in linear spaces (2007, unknown): “[2,9].”
Boundary Value Problems, Weyl Functions, and Differential Operators (2020, background): “Linear relations in Hilbert spaces go back at least to Arens [42]; they attracted attention because of their usefulness in the extension theory of not necessarily densely defined operators; see for instance [82, 128, 202, 218, 266, 297, 523, 619, 638].”