Fredholm Operator - B-Fredholm Operators

B-Fredholm Operators

For each integer, define to be the restriction of to viewed as a map from into ( in particular ). If for some integer the space is closed and is a Fredholm operator,then is called a B-Fredholm operator. B-Fredholm operators were introduced by M. Berkani in 1999 as a generalization of Fredholm operators.