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The original Weyl-Titchmarsh functions and sectorial Schrödinger L-systems. (English) Zbl 07523171

de Snoo, H. S. V. (ed.) et al., Contributions to mathematics and statistics. Essays in honor of Seppo Hassi. Vaasa: University of Vaasa, School of Technology and Innovation. Acta Wasaensia 462, 37-53 (2021).
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Dichotomous Hamiltonians and Riccati equations for systems with unbounded control and observation operators. (English) Zbl 07396964

Kerner, Joachim (ed.) et al., Control theory of infinite-dimensional systems. Contributions of the workshop, Fernuniversität Hagen, Hagen, Germany, January 10–12, 2018. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 277, 158-194 (2020).
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Fixed points of nonlinear operators. Iterative methods. (English) Zbl 1440.47001

De Gruyter STEM. Berlin: De Gruyter; National Defense Industry Press (ISBN 978-3-11-066397-6/pbk; 978-3-11-066709-7/ebook). x, 368 p. (2020).
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An existence principle for variational inequalities in Banach spaces. (English) Zbl 1443.49017

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