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Implementing Local Intervals in CASL

Regivan H. N. SantiagoAnamaria Martins MoreiraKatiane Lopes

This paper defines the basis for the implementation in CASL (Common Algebraic Specification Language) of an interval library such that intervals behave as real numbers endowed with an error information. To achieve that, we redefine the notion of interval local set defined in [16] in such a way that it can be implemented in the underlying logic of CASL. With these results, it is possible to manipulate intervals in CASL, as if they were real numbers, with equational reasoning, and get an error estimation on the obtained results for free (from the width of the resulting interval). The paper describes the CASL definition of the interval library and presents a case study on a simple example requiring handling data with “tolerance” margin.

http://www.lbd.dcc.ufmg.br/colecoes/sbmf/2005/

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