Isaac Levi’s Potentially Surprising Epistemological Picture

There can be no doubt about how much Isaac Levi has taught us in epistemological matters, I certainly have no doubt as far as I am concerned. Yet, not for the first time I wonder at how philosophers can be so close and so different at the same time. The better the comparability, I assume, the sharper the comparison. Hence, this paper is devoted to a brief comparison of Levi’s epistemological picture and mine. It mainly stays on an informal level, aiming at the basic features. The intention is not a critical one. It is rather to promote mutual understanding, because the similarities and differences are not easy to grasp. Current discussions in formal epistemology tend to be quite specialized, building on rich, but not well reflected presuppositions. So, a brief look at its history may be healthy. It is indeed necessary for understanding Levi’s role and position. The history of formal epistemology is predominantly that of probability theory. Mathematical probability was the only clear structure that emerged through the centuries. Not that there would have been no alternatives at all. There are various ideas, perhaps subsumable under the heading “Baconian probability”, which hung around for centuries as well. But they never took a clear and determinate shape, and thus probability theory could develop its unrivalled power, culminating, as far