Roundoff errors are inevitable if the exact result of some operation is not representable in a computer, and has, therefore, to be approximated. To avoid roundoff errors, it is hence necessary to choose a set of computer-representable numbers in such a way that the results of all basic operations will be still in this set. In this paper, we prove that if we include arithmetic operations and computing the interval range into this operations list, then the set F of numbers will be roundoff-free iff F is a real closed field; therefore, the smallest such set is the set of all real algebraic numbers (i.e., solutions of polynomial equations with rational coefficients).
Reliable Computing – Springer Journals
Published: Oct 3, 2004
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