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A Theory of Abduction and Induction is outlined within the framework of Labelled Deductive Systems (LDS). It is argued that abductive principles are dependent on the computation procedures and are to be considered as items of data in the database.
In this paper the main results of DRUMS R.P3.3 Task ’Propagation of Uncertainty in Dependence Graphs’ are presented. It is divided in two parts. In the first one, it is considered a new calculus with imprecise probabilities, which is not as uninformative as classical one, [6, 7, 9]. In the second one, the axiomatic squeme given in [11] has been adapted to Pearl's causal networks, [10], by introducing...
In this paper we study possibility theory from the point of view of modal logic. Our first and main result is that the logic of qualitative possibility is nothing else than Lewis's conditional logic VN. Second, we propose a multi-modal logic able to support possibility theory. Some connexions between these formalisms are stressed.
The DRUMS project is addressing a variety of symbolic and numerical techniques for reasoning under uncertainty and with incomplete information. This paper discusses work which is directed towards identifying a unifying framework which will enable a variety of uncertainty handling techniques to be integrated in a single programming environment.
This paper describes the work performed in the ESPRIT Basic Research Action DRUMS, on the elicitation and use of finite sets of linguistic espressions of uncertainty within modular expert systems. Such finite sets of linguistic terms, together with their connective operators define multiple-valued local logics associated to different modules implementing different subtasks of the expert system. Taking...
We will describe here the learning algorithms we have implemented in CASTLE, (Causal Structures From Inductive Learning), to learn about causal structures from examples. A brief introduction to the software ifself and a description of what we intend to develop and implement in CASTLE are also given. Finally, the use of CASTLE is illustrated on a simple example.
The research reported in this paper was originally motivated by some defects in Reiter's DL. A first solution, CDL, solved the problems but introduced a new one, the floating conclusions problem. We therefore developed a new default logic, CDL*, which is distinct from CDL in the following respects: assertions with multiple supports are admitted one single set of credulous beliefs containing...
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