The basic idea in representing uncertainty in this model is:
If is the set of possible outcomes, then a mass probability, M, is defined for each member of the set and takes values in the range [0,1].
The Null set, , is also a member of .
NOTE: This deals wit set theory terminology that will be dealt with in a tutorial shortly. Also see exercises to get experience of problem solving in this important subject matter.
M is a probability density function defined not just for but for em all subsets.
So if is the set { Flu (F), Cold (C), Pneumonia (P) } then is the set { , {F}, {C}, {P}, {F, C}, {F, P}, {C, P}, {F, C, P} }