13 found
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  1.  9
    Elements of the Theory of Computation.Harry R. Lewis & Christos H. Papadimitriou - 1984 - Journal of Symbolic Logic 49 (3):989-990.
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  2. Linear Sampling and the ∀∃∀ Case of the Decision Problem.Stal O. Aanderaa & Harry R. Lewis - 1974 - Journal of Symbolic Logic 39 (3):519-548.
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  3.  18
    ΠGarey Michael R. And Johnson David S.. Computers and Intractability. A Guide to the Theory of NP-Completeness. W. H. Freeman and Company, San Francisco 1979, X + 338 Pp. [REVIEW]Harry R. Lewis - 1983 - Journal of Symbolic Logic 48 (2):498-500.
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  4.  13
    Unsolvable Classes of Quantificational Formulas.Harry R. Lewis - 1979 - Addison-Wesley.
  5.  5
    Unsolvable Classes of Quantificational Formulas.Harry R. Lewis - 1982 - Journal of Symbolic Logic 47 (1):221-222.
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  6.  18
    The Word Problem for Cancellation Semigroups with Zero.Yuri Gurevich & Harry R. Lewis - 1984 - Journal of Symbolic Logic 49 (1):184-191.
  7.  28
    The Decision Problem for Formulas with a Small Number of Atomic Subformulas.Harry R. Lewis & Warren D. Goldfarb - 1973 - Journal of Symbolic Logic 38 (3):471-480.
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  8.  19
    Krom Formulas with One Dyadic Predicate Letter.Harry R. Lewis - 1976 - Journal of Symbolic Logic 41 (2):341-362.
  9.  39
    Conservative Reduction Classes of Krom Formulas.Stål O. Aanderaa, Egon Börger & Harry R. Lewis - 1982 - Journal of Symbolic Logic 47 (1):110-130.
    A Krom formula of pure quantification theory is a formula in conjunctive normal form such that each conjunct is a disjunction of at most two atomic formulas or negations of atomic formulas. Every class of Krom formulas that is determined by the form of their quantifier prefixes and which is known to have an unsolvable decision problem for satisfiability is here shown to be a conservative reduction class. Therefore both the general satisfiability problem, and the problem of satisfiability in finite (...)
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  10.  25
    Prefix Classes of Krom Formulas.Stål O. Aanderaa & Harry R. Lewis - 1973 - Journal of Symbolic Logic 38 (4):628-642.
  11.  23
    Skolem Reduction Classes.Warren D. Goldfarb & Harry R. Lewis - 1975 - Journal of Symbolic Logic 40 (1):62-68.
  12. Elements of the Theory of Computation Harry R. Lewis, Christos H. Papadimitriou.Harry R. Lewis & Christos H. Papadimitriou - 1998
     
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  13. Review: Michael R. Garey, David S. Johnson, Computers and Intractability. A Guide to the Theory of NP-Completeness. [REVIEW]Harry R. Lewis - 1983 - Journal of Symbolic Logic 48 (2):498-500.