The authors take as undefined the expression, "p is epistemically preferable to q for s at t", Which they interpret as referring to a relation that may hold among a man's believings ("he believes h"), His disbelievings ("he believes not-H"), And his withholdings ("he believes neither h nor not-H"). Seven axioms of epistemic preferability are set forth from which the authors deduce some 60 theorems. Some of these theorems are described as "pyrrhonistic." several fundamental epistemic concepts are defined in terms (...) of epistemic preferability. Among them are those suggested by the terms "some presumption in its favor", "acceptable", "beyond reasonable doubt", "evident", "certain", And "counterbalanced". (shrink)