Now showing items 1-4 of 4

    • Complexity of proper prefix-convex regular languages 

      Brzozowski, Janusz; Sinnamon, Corwin (Elsevier, 2019-10-01)
      A language L over an alphabet Σ is prefix-convex if, for any words x,y,z ∈ Σ*, whenever x and xyz are in L, then so is xy. Prefix-convex languages include right-ideal, prefix-closed, and prefix-free languages, which were ...
    • Most Complex Regular Ideal Languages 

      Liu, Bo Yang Victor; Davies, Sylvie; Brzozowski, Janusz (Discrete Mathematics and Theoretical Computer Science, 2016-10-17)
      A right ideal (left ideal, two-sided ideal) is a non-empty language $L$ over an alphabet $\Sigma$ such that $L=L\Sigma^*$ ($L=\Sigma^*L$, $L=\Sigma^*L\Sigma^*$). Let $k=3$ for right ideals, 4 for left ideals and 5 for ...
    • Most Complex Regular Right-Ideal Languages 

      Brzozowski, Janusz; Davies, Gareth (Springer, 2014)
      A right ideal is a language L over an alphabet Sigma that satisfies the equation L = L Sigma*. We show that there exists a sequence (Rn vertical bar n >= 3) of regular right-ideal languages, where R-n has n left quotients ...
    • Quotient Complexities of Atoms in Regular Ideal Languages 

      Brzozowski, Janusz; Davies, Sylvie (Institute of Informatics: University of Szeged, 2015)
      A (left) quotient of a language L by a word w is the language w(-1) L = {x vertical bar wx is an element of L}. The quotient complexity of a regular language L is the number of quotients of L; it is equal to the state ...


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