'''''Interval computer'''''s are a special kind of theoretical models for computation that are capable of working on "interval“interval-valued bytes"bytes”: special subsets of the (0, 1) real interval. Thus, they can be regarded as kind of ideal [[analog computer]]s. There are no architectures for their physical implementations. Such a model of computation is capable of solving [[NP-complete]] problems like [[tripartite matching]].<ref>[[#TaNa08|Tajti & Nagy 2008]]</ref> “The [[Boolean satisfiability problem#Extensions_of_SAT|validity problem of quantified propositional formulae]] is decidable by a linear interval-valued computation. As a consequence, all [[PSPACE|polynomial space problem]]s are decidable by a polynomial interval-valued computation. Furthermore, it is proven that PSPACE coincides with the class of languages which are decidable by a restricted polynomial interval-valued computation” (links added).<ref>[[#NaVa08|Nagy & Vályi 2008]]</ref>
