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Title: Dlogtime  
Author: World Heritage Encyclopedia
Language: English
Subject: AC0, ComplexityClasses, ALL (complexity), R (complexity), PR (complexity)
Collection: Complexity Classes
Publisher: World Heritage Encyclopedia


In computational complexity theory, DLOGTIME is the complexity class of all computational problems solvable in a logarithmic amount of computation time on a deterministic Turing machine. It must be defined on a random-access Turing machine, since otherwise the input tape is longer than the range of cells that can be accessed by the machine. It is a very weak model of time complexity: no random-access Turing machine with a smaller deterministic time bound can access the whole input.[1]

DLOGTIME-uniformity is important in circuit complexity.[1][2]


  1. ^ a b Johnson, David S. (1990), "A catalog of complexity classes", Handbook of theoretical computer science, Vol. A, Elsevier, Amsterdam, pp. 67–161,  . See in particular p. 140.
  2. ^ Allender, Eric; Gore, Vivek (1993), "On strong separations from AC0", Advances in computational complexity theory (New Brunswick, NJ, 1990), DIMACS Ser. Discrete Math. Theoret. Comput. Sci. 13, Amer. Math. Soc., Providence, RI, pp. 21–37,  . See in particular p. 23.
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