Miarka, R. and Derrick, J. and Boiten, E.A. (2002) Handling Inconsistencies in Z using Quasi-Classical Logic. In: Berto, D. and Bowen, J.P. and Henson, M.C. and Robinson, K., eds. ZB 2002:Formal Specification and Development in Z and B. Lecture Notes in Computer Science, 2272. Springer-Verlag Berlin Heidelberg, Grenoble, France pp. 204-225. ISBN 3-540-43166-7.
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The aim of this paper is to discuss what formal support can be given to the process of living with inconsistencies in Z, rather than eradicating them. Logicians have developed a range of logics to continue to reason in the presence of inconsistencies. We present one representative of such paraconsistent logics, namely Hunter's quasi-classical logic, and apply it to the analysis of inconsistent Z schemas. In the presence of inconsistency quasi-classical logic allows us to derive less, but more ``useful'', information. Consequently, inconsistent Z specifications can be analysed in more depth than at present. Part of the analysis of a Z operation is the calculation of the precondition. However, in the presence of an inconsistency, information about the intended application of the operation may be lost. It is our aim to regain this information. We introduce a new classification of precondition areas, based on the notions of definedness, overdefinedness and undefinedness. We then discuss two options to determine these areas both of which are based on restrictions of classical reasoning.
|Item Type:||Conference or workshop item (Paper)|
|Uncontrolled keywords:||Z, Quasi-classical logic, Inconsistency|
|Subjects:||Q Science > QA Mathematics (inc Computing science) > QA 76 Software, computer programming,|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Computing > Theoretical Computing Group|
|Depositing User:||Mark Wheadon|
|Date Deposited:||24 Nov 2008 18:00|
|Last Modified:||12 Jun 2012 12:56|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/13830 (The current URI for this page, for reference purposes)|
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