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Found 94 Documents (Results 1–94)

The characteristic polynomial of linear pencils of small size and the numerical range. (English) Zbl 1400.15021

Bebiano, Natália (ed.), Applied and computational matrix analysis. MAT-TRIAD, Coimbra, Portugal, September 7–11, 2015. Selected, revised contributions. Cham: Springer (ISBN 978-3-319-49982-6/hbk; 978-3-319-49984-0/ebook). Springer Proceedings in Mathematics & Statistics 192, 181-197 (2017).
MSC:  15A60 15A15
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Fields of values of linear pencils and spectral inclusion regions. (English) Zbl 1402.65032

Bebiano, Natália (ed.), Applied and computational matrix analysis. MAT-TRIAD, Coimbra, Portugal, September 7–11, 2015. Selected, revised contributions. Cham: Springer (ISBN 978-3-319-49982-6/hbk; 978-3-319-49984-0/ebook). Springer Proceedings in Mathematics & Statistics 192, 165-179 (2017).
MSC:  65F30 15A60 15A22
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The main diagonal products of \( 3 \times 3\) normal matrices whose eigenvalues are the third roots of unity. (English) Zbl 1298.15042

Fonseca, Carlos (ed.) et al., The Natália Bebiano anniversary volume. Special issue on the occasion of her 60th birthday. Coimbra: Universidade de Coimbra, Departamento de Matemática (ISBN 978-972-8564-48-3/pbk). Textos de Matemática 44, 145-151 (2013).
MSC:  15B57 15A60
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Some geometrical properties of the c-numerical range of a normal matrix. (English) Zbl 1002.15501

Marques de Sá, Eduardo (ed.) et al., Mathematical studies. Homage to Professor Doctor Luís de Albuquerque. Coimbra: Universidade de Coimbra, Faculdade de Ciências e Tecnologia, Departamento de Matemática, 17-32 (1994).
MSC:  15A60 15B57
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Some observations on the concept of permanent. (Portuguese) Zbl 0791.15006

Studies in mathematics. An homage to Renato Pereira Coelho. Coimbra: Departamento de Matemática, Faculdade de Ciências e Tecnologia. Universidade de Coimbra, 145-154 (1992).
MSC:  15A15
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