03978278

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03978278 Chatelin, Francoise Ill conditioned eigenproblems. Large scale eigenvalue problems, Proc. IBM Eur. Inst. Workshop, Oberlech/Austria 1985, North-Holland Math. Stud. 127, 267-282 (1986). 1986 EN method of simultaneous inverse iterations invariant subspace defective eigenvalue Newton' method Zbl 0595.00022 [For the entire collection see Zbl 0595.00022.] The method of simultaneous inverse iterations is unstable when it is used to compute the invariant subspace of a defective eigenvalue. In this paper we propose a stable method, of equal complexity, which is based on a modification of Newton' method.