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A publicação pode ser exportada nos seguintes formatos: referência da APA (American Psychological Association), referência do IEEE (Institute of Electrical and Electronics Engineers), BibTeX e RIS.

Exportar Referência (APA) 
Carvalho, L., Diogo, C., Mendes, S. & Soares, H. (2024). A note on the essential numerical range of block diagonal operators. Forum Mathematicum. 36 (5), 1147-1157
Exportar Referência (IEEE) 
L. C. Carvalho et al.,  "A note on the essential numerical range of block diagonal operators", in Forum Mathematicum, vol. 36, no. 5, pp. 1147-1157, 2024
Exportar BibTeX 
@article{carvalho2024_1781499563829,
	author = "Carvalho, L. and Diogo, C. and Mendes, S. and Soares, H.",
	title = "A note on the essential numerical range of block diagonal operators",
	journal = "Forum Mathematicum",
	year = "2024",
	volume = "36",
	number = "5",
	doi = "10.1515/forum-2023-0166",
	pages = "1147-1157",
	url = "https://www.degruyter.com/journal/key/form/html"
}
Exportar RIS 
TY  - JOUR
TI  - A note on the essential numerical range of block diagonal operators
T2  - Forum Mathematicum
VL  - 36
IS  - 5
AU  - Carvalho, L.
AU  - Diogo, C.
AU  - Mendes, S.
AU  - Soares, H.
PY  - 2024
SP  - 1147-1157
SN  - 0933-7741
DO  - 10.1515/forum-2023-0166
UR  - https://www.degruyter.com/journal/key/form/html
AB  - In this note, we characterize the essential numerical range of a block diagonal operator T = ?i Ti in terms of the numerical ranges {W(Ti)}i of its components. Specifically, the essential numerical range of T is the convex hull of the limit superior of {W(Ti)}i. This characterization can be simplified further. In fact, we prove the existence of a decomposition of T for which the convex hull is not required.
ER  -