Title
Normality and two-way automata
Abstract
We prove that two-way transducers (both deterministic and non-deterministic) cannot compress normal numbers. To achieve this, we first show that it is possible to generalize compressibility from one-way transducers to two-way transducers. These results extend a known result: normal infinite words are exactly those that cannot be compressed by lossless finite-state transducers, and, more generally, by bounded-to-one non-deterministic finite-state transducers. We also argue that such a generalization cannot be extended to two-way transducers with unbounded memory, even in the simple form of a single counter.
Year
DOI
Venue
2015
10.1016/j.ic.2015.02.001
Inf. Comput.
Keywords
Field
DocType
compression,normal numbers,two-way automata
Compressibility,Normality,Discrete mathematics,Combinatorics,Automaton,Mathematics,Normal number,Lossless compression
Journal
Volume
Issue
ISSN
241
C
0890-5401
Citations 
PageRank 
References 
3
0.52
9
Authors
2
Name
Order
Citations
PageRank
Olivier Carton138140.97
Pablo Ariel Heiber2508.38