What is meant by sI A1 is called the resolvent of ASolution

Solution

(whose identities are the zero 0 and one 1) is a matrix composed of 0 elements ... Any block diagonal matrix whose blocks are Jordan blocks is called a Jordan ... which will be hereinafter supposed to be 0 for simplicity\'s sake. .... The matrix function \\left(A-sI\ ight)^{-1} is called the resolvent matrix of the differential operator ...