Abstract. Let P and Q be bounded linear operators on a Banach space. The existence of the Drazin inverse of P + Q is proved under some assumptions, and the representations of (P + Q)D are also given.

A function machine is a way of writing rules using a flow diagram. The equation \(3j - 6 = 9\) can be shown on a function machine by writing out the functions that have been applied to \(j\) in the ...

This is a preview. Log in through your library . Abstract Identities for the inverse Wishart distribution are given which are parallel to known identities for the Wishart case. Useful relationships ...