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Exact real computer arithmetic with continued fractions

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1 Author(s)
Vuillemin, J.E. ; Centre de Recherche de Paris, France

A representation of the computable real numbers by continued fractions is introduced. This representation deals with the subtle points of undecidable comparison and integer division, as well as representing the infinite 1/0 and undefined 0/0 numbers. Two general algorithms for performing arithmetic operations are introduced. The algebraic algorithm, which computes sums and products of continued fractions as a special case, basically operates in a positional manner, producing one term of output for each term of input. The transcendental algorithm uses a general formula of Gauss to compute the continued fractions of exponentials, logarithms, trigonometric functions, and a wide class of special functions. A prototype system has been implemented in LeLisp and the performance of these algorithms is promising

Published in:

Computers, IEEE Transactions on  (Volume:39 ,  Issue: 8 )

Date of Publication:

Aug 1990

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