An introduction to symbolic dynamics and coding
An introduction to symbolic dynamics and coding
A ``Binary'' System for Complex Numbers
Journal of the ACM (JACM)
Necessary and Sufficient Conditions for Parallel, Constant Time Conversion and Addition
ARITH '99 Proceedings of the 14th IEEE Symposium on Computer Arithmetic
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We consider numeration systems where digits are integers and the base is an algebraic number @b such that |@b|1 and @b satisfies a polynomial where one coefficient is dominant in a certain sense. For this class of bases @b, we can find an alphabet of signed-digits on which addition is realizable by a parallel algorithm in constant time. This algorithm is a kind of generalization of the one of Avizienis. We also discuss the question of cardinality of the used alphabet, and we are able to modify our algorithm in order to work with a smaller alphabet. We then prove that @b satisfies this dominance condition if and only if it has no conjugate of modulus 1. When the base @b is the Golden Mean, we further refine the construction to obtain a parallel algorithm on the alphabet {-1,0,1}. This alphabet cannot be reduced any more.