%0 Journal Article %T On structured pseudo spectra for polynomial eigenvalue problems %A M. F. Hama %J International Journal of Algebra %D 2013 %I %X Pseudospectra associated with the generalized eigenvalue problemshave been widely investigated in recent years. This paper is organizedas follows. First, we prove for a class¡Ê{Symmetric, Persymmetric,Toeplitz, SymToeplitz, Hankel, PersymHankel, Circulant}, we havethe classed pseudospectrum of matrix is equal to the unclassed pseudospectrumbecause of the departure from singularity. Second, we provethe same results for classed pseudospectra of matrix polynomials. %K Polynomial eigenvalue problem %K Matrix polinomials %K pseudospectrum %K classed pseudospectrum %U http://www.m-hikari.com/ija/ija-2013/ija-1-4-2013/hamaIJA1-4-2013-1.pdf