An Implicit Recursive Language for the Polynomial Time-space Complexity Classes
Emanuele Covino (Dipartimento di Informatica dell'Università di Bari, Italy)
Giovanni Pani (Dipartimento di Informatica dell'Università di Bari, Italy)
Abstract: We define a language over an algebra of words by means of a version of predicative recursion, and we prove that it represents a resource-free characterization of the computations performed by a register machine in time O(nk), for each denite k; starting from this result, and by means of a restricted form of composition, we give a characterization of the computations of a register machine with a polynomial bound simultaneously imposed over time and space complexity.
Keywords: implicit computational complexity, predicative recursion, time-space classes