Short propositional formulas represent nondeterministic computations
Information Processing Letters
Two tapes versus one for off-line Turing machines
Computational Complexity
Relations Between Time and Tape Complexities
Journal of the ACM (JACM)
Separating Nondeterministic Time Complexity Classes
Journal of the ACM (JACM)
Time—space tradeoffs for satisfiability
Journal of Computer and System Sciences - Eleventh annual conference on computational learning theory&slash;Twelfth Annual IEEE conference on computational complexity
Matching upper and lower bounds for simulations of several linear tapes on one multidimensional tape
Computational Complexity
Time-Space Tradeoffs for Nondeterministic Computation
COCO '00 Proceedings of the 15th Annual IEEE Conference on Computational Complexity
FOCS '99 Proceedings of the 40th Annual Symposium on Foundations of Computer Science
Alternation and the power of nondeterminism
STOC '83 Proceedings of the fifteenth annual ACM symposium on Theory of computing
Time-Space Tradeoffs for Counting NP Solutions Modulo Integers
Computational Complexity
Alternation-Trading Proofs, Linear Programming, and Lower Bounds
ACM Transactions on Computation Theory (TOCT)
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We show that a deterministic Turing machine with one d-dimensional work tape and random access to the input cannot solve satisfiability in time na for a d + 2)/(d + 1). For conondeterministic machines, we obtain a similar lower bound for any a such that a3 a/(d + 1). The same bounds apply to almost all natural NP-complete problems known.