I just read from here that if an operator $T$ from and to a Banach space can be written as a sum of a compact operator and an invertible operator then it is Fredholm.
I would like to prove this but I don't get it. Can someone help me?
2026-04-24 01:10:19.1776993019
Operator is Fredholm if it is the sum of an Invertible and a Compact operator
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