Perturbations by operators converging compactly to zero
1977 ◽
Vol 81
(3)
◽
pp. 387-391
AbstractThis paper considers perturbations in locally convex spaces of semi Fredholm operators T by a sequence of operators {Kn} converging compactly to zero in a sense extending that from (2). It is shown that, under suitable conditions, α(T + Kn) ≤ α(T), β(T + Kn) ≤ β;(T) and κ(T + Kn) = κ(T) for large n.
2015 ◽
Vol 22
(4)
◽
pp. 550-552
◽
1966 ◽
Vol 17
(1)
◽
pp. 148-148
◽
1985 ◽
Vol 8
(2)
◽
pp. 276-288
◽
Keyword(s):
2002 ◽
Vol 121
(1-2)
◽
pp. 75-89
◽
1968 ◽
Vol 2
(3)
◽
pp. 258-296
◽