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The Chain Method to Separate Counting Classes

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Abstract

We introduce a new method to separate counting classes of a special type by oracles. Among the classes, for which this method is applicable, are NP, coNP, US (also called 1-NP), ⊕ P, all other MOD-classes, PP, and C = P, classes of Boolean Hierarchies over the named classes, classes of finite acceptance type, and many more. As an important special case, we completely characterize all relativizable inclusions between classes NP(k) from the Boolean Hierarchy over NP and other classes defined by what we call bounded counting.

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Authors and Affiliations

  1. Theoretische Informatik, Universität Würzburg, Am Exerzierplatz 3, D-97072 Würzburg, Germany, Germany

    K. Cronauer, H. Vollmer & K. W. Wagner

  2. Abteilung Theoretische Informatik, Universität Stuttgart, Breitwiesenstrasse 20—22, D-70565 Stuttgart, Germany, Germany

    U. Hertrampf

Authors
  1. K. Cronauer
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  2. U. Hertrampf
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  3. H. Vollmer
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  4. K. W. Wagner
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Received January 1996, and in final form November 1996.

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Cronauer, K., Hertrampf, U., Vollmer, H. et al. The Chain Method to Separate Counting Classes. Theory Comput. Systems 31, 93–108 (1998). https://doi.org/10.1007/s002240000080

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  • DOI: https://doi.org/10.1007/s002240000080