Belief Calculus, ABC, see Darwiche, Ginsberg (1992), and Stern (2003). 〈Φ,⊕, 〉 , Support Structure, Φ , Support Function, for statements on U. Null and full support values are 0 and 1. ⊕ , Support Summation operator, , Support Scaling or Conditionalization, 〈Φ,⊕〉 , Partial Support Structure. ⊕, gives the support value of the disjunction of any two logically disjoint statements from their indivi...