In this article we provide a version of Chow's theorem for real analytic Levi-flat hypersurfaces in the complex projective space Pn, n≥2. More specifically, prove that hypersurface M⊂Pn, with singular set dimension at most 2n−4 and whose Levi leaves are contained algebraic hypersurfaces, is tangent to levels rational function Pn. As consequence, M semialgebraic set. We also foliation on Pn — im...

Most works on iterated belief change have focussed on iterated belief revision, namely, on how to compute (K∗ x)∗y . However, historically, belief revision has been defined in terms of belief expansion and belief contraction that have been viewed as primary operations. Accordingly, what we should be looking at are constructions like: (K+ x ) + y , (K − x ) + y , (K + x ) − y and (K− x )−y . The...

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The branch of philosophical logic which has become known as “belief change” has, in the course of its development, become alienated from its epistemological origins. However, as formal criteria do not suffice to defend a principled choice between competing systems for belief change, we do need to take their epistemological embedding into account. Here, on the basis of a detailed examination of ...