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Dempster's rule allows aggregation
of two different bodies of evidence 
and 
on the same reference set.
We can imagine that several experts indicate their opinion via the attribution
of masses of belief m1 and m2 over
, or
that two successive experiments allow such an attribution.
Dempster's rule of combination highlights
combined masses of belief in the following way:
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The denominator is a coefficient of normalization. In particular, if it is null, it means that there is a total conflict between the sources, and aggregation is then impossible.
The use of this rule is thus valid only when the sources are sufficiently
in agreement. This operator is unstable when the conflict is very strong,
as shown by [Zadeh, 1984] (see also
[Smets, 1990]).
