In this paper we adopt the geometric approach to the theory of evidence to study the geometric counterparts of the plausibility functions, or upper probabilities. The computation of the coordinate change between the two natural reference frames in the belief space allows us to introduce the dual notion of basic plausibility assignment and understand its relation with the classical basic probability assignment. The convex shape of the plausibility space $\Pi$ is recovered in analogy to what done for the belief space, and the pointwise geometric relation between a belief function and the corresponding plausibility vector is discussed. The orthogonal projection of an arbitrary belief function $s$ onto the probabilistic subspace is computed and compared with other significant entities, such as the relative plausibility and mean probability vectors.
Keywords. Theory of evidence, belief space, basic plausibility assignment, plausibility space, orthogonal projection
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Authors addresses:
Dipartimento di Ingegneria dell'Informazione
Via Gradenigo 6/A
35131 Padova
Italy
E-mail addresses:
| Fabio Cuzzolin | cuzzolin@dei.unipd.it |
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