A method to rigorously enclose eigendecompositions of interval matrices
  In this paper, a rigorous computational method to enclose eigendecompositions of complex interval matrices is proposed. Each eigenpair $x=(\lambda,v)$ is found by solving a nonlinear equation of the form $f(x)=0$ via a contraction argument. The set-up of the method relies on the notion of radii polynomials, which provide an efficient mean of determining a domain on which the contraction mapping theorem is applicable. 
Roberto Castelli, Jean-Philippe Lessard
math.DS math.NA math.SP