"Just Because": Taking Belief Bases Seriously
Hans Rott

Abstract:
We formalize several ways of accounting, in the context of logically closed 
theories, for foundationalist intuitions that underlie change operations 
applying to belief bases. A positive and a negative concept of entrenchment 
is defined on the basis of the structure of a given, possibly prioritized 
belief base. Only the latter, more fine-grained concept proves to be 
appropriate for a successful attempt at approximating base changes on the
theory level. We investigate the question as to which degree we can comply
with the fundamental intuition expressed by the various Filtering Conditions
that say that all (and only) beliefs that are believed "just because" a
retracted belief was believed should be withdrawn.