On the boundary spectrum in banach algebras
2006 ◽
Vol 74
(2)
◽
pp. 239-246
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Keyword(s):
We investigate some properties of the set S∂(a) = {λ ∈ ℂ: λ – a ∈ ∂S} (which we call the boundary spectrum of a) where ∂S denotes the topological boundary of the set S of all non-invertible elements of a Banach algebra A, and where a is an element of A.
1979 ◽
Vol 84
(1-2)
◽
pp. 55-70
◽
2018 ◽
Vol 11
(02)
◽
pp. 1850021
◽
1967 ◽
Vol 8
(1)
◽
pp. 41-49
◽
Keyword(s):
2018 ◽
Vol 17
(09)
◽
pp. 1850169
◽
1973 ◽
Vol 79
(1)
◽
pp. 82-85
◽
1959 ◽
Vol 11
◽
pp. 297-310
◽