Morten Elvang-Gøransson

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From an inconsistent database non-trivial arguments may be constructed both for a proposition, and for the contrary of that proposition. Therefore, inconsistency in a logical database causes uncertainty about which conclusions to accept. This kind of uncertainty is called logical uncertainty. We define a concept of "acceptability" , which in­ duces a means(More)
Classical logic has many appealing features for knowledge representation and reasoning. But unfortunately it is awed when reasoning about inconsistent information, since anything follows from a classical inconsistency. This problem is addressed by introducing the notions of \argument" and of \acceptability" of an argument. These notions are used to(More)
Argumentation is the process of constructing arguments about propositions, and the assign­ ment of statements of confidence to those propo­ sitions based on the nature and relative strength of their supporting arguments. The process is modelled as a labelled deductive system, in which propositions are doubly labelled with the grounds on which they are based(More)
The original de nition of re nement proof obligations in VDM is reviewed and examples are discussed which while being in tuitively sensible pose problems for this de nition of re nement An extended VDM re nement relation is introduced to cope with the prob lems Some non standard applications of the extended re nement proof obligations are discussed
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