Showing 2016Show all
2 papers · 1 filter
math.SP2016
A trace formula for the index of B-Fredholm operators
Mohammed Berkani
In this paper we define B-Fredholm elements in a Banach algebra modulo an ideal of When a trace function is given on the ideal it generate an index for B-Fredholm…
math.SP2016
On the B-discrete spectrum
Mohammed Berkani
In this paper, we introduce the B-discrete spectrum of an unbounded closed operator and we prove that a closed operator has a purely B-discrete spectrum if and only if it has a mer…