Scotts theorem and other theorems give conditions under which a qualitative ordering (>= for at least as probable than) which satisfies certain constraints (total pre-order, finite cancellation axioms and others) is such that it is represented by some P on [0,1] that is such that 'if A>= B iff P(A)>P(B)' that is a finite additive probability function. 

When conditions are relaxed so that we have only the conditional rather than the bi-conditional, whereby 'if A>=B then P(A)>P(B)' P is a finitely additive probability function, this is call almost or weak representation. What are the disadvantages of weak representation, does it only ensure the compatibility rather than the necessity of a finitely additive structure or is that the strong representation entails that the numerical probability function P is unique is something similar

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