"=>" is fine if foral A">" empty set there exists a finite partition
{E1,...,En} of O s.t. A"=>" Ei forall i.
fine => PA1
tight /\ fine => P a representation of ">"
Proposition:
"=>" QP(qualitative probability) /\ fine /\ tight => PA1 /\ P(A) > P(B) <=> A">"B