Keywords :
Automatic sequences; Constant-recursive sequences; Magic numbers; Periodic sequences; Regular sequences; Constant-recursive sequence; Deterministic finite automata; Formal languages and automata; Integer-N; Nondeterministic finite automaton; Periodic sequence; Recursive sequences; Regular sequence; Theoretical Computer Science; Computer Science (all)
Abstract :
In formal languages and automata theory, the magic number problem can be formulated as follows: for a given integer n, is it possible to find a number d in the range [ n, 2 n] such that there is no minimal deterministic finite automaton with d states that can be simulated by a minimal nondeterministic finite automaton with exactly n states? If such a number d exists, it is called magic. In this paper, we consider the magic number problem in the framework of deterministic automata with output, which are known to characterize automatic sequences. More precisely, we investigate magic numbers for periodic sequences viewed as either automatic, regular, or constant-recursive.
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