منابع مشابه
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متن کاملPlanar Lombardi Drawings of Outerpaths
A Lombardi drawing of a graph is a drawing where edges are represented by circular arcs that meet at each vertex v with perfect angular resolution 360◦/deg(v) [3]. It is known that Lombardi drawings do not always exist, and in particular, that planar Lombardi drawings of planar graphs do not always exist [1], even when the embedding is not fixed. Existence of planar Lombardi drawings is known f...
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We prove that for every singular cardinal μ of cofinality ω, the complete Boolean algebra compPμ(μ) contains a complete subalgebra which is isomorphic to the collapse algebra CompCol(ω1, μ0 ). Consequently, adding a generic filter to the quotient algebra Pμ(μ) = P(μ)/[μ] collapses μ0 to א1. Another corollary is that the Baire number of the space U(μ) of all uniform ultrafilters over μ is equal ...
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ژورنال
عنوان ژورنال: British Journal of Psychiatry
سال: 2010
ISSN: 0007-1250,1472-1465
DOI: 10.1192/bjp.197.1.19