Let A ∈B(X) and B ∈B(Y ), MC be an operator on Banach space X⊕Y given by MC =(AC 0B).A generalized Drazin spectrum defined by σ gD(T ) = {λ ∈ C : T ?λI i
A reduced-order extrapolation algorithm based on Crank-Nicolson least-squares mixed finite element (CNLSMFE) formulation and proper orthogonal decomposition (PO