Abstract
Results on the inverse interval matrix, both theoretical and computational, are surveyed. Described are, among others, formulae for the inverse interval matrix, NP-hardness of its computation, various classes of interval matrices for which the inverse can be given explicitly, and closed-form formulae for an enclosure of the inverse. 1. Introduction. In our recent paper (20), we presented a survey of forty nec- essary and sufficient conditions for regularity of interval matrices. It is nowfollowed by a survey of properties of the inverse interval matrix which is closely related to the previous topic because the inverse interval matrix is only defined for regular interval
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