Galina Jirásková (Slovak Academy of Sciences) |
Alexander Okhotin (University of Turku) |

Consider nondeterministic finite automata recognizing base-k positional notation of numbers. Assume that numbers are read starting from their least significant digits. It is proved that if two sets of numbers S and T are represented by nondeterministic automata of m and n states, respectively, then their sum s+t | s in S, t in T is represented by a nondeterministic automaton with 2mn+2m+2n+1 states. Moreover, this number of states is necessary in the worst case for all k>=9. |

Published: 30th July 2009.

ArXived at: http://dx.doi.org/10.4204/EPTCS.3.14 | bibtex | |

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