منابع مشابه
Conjunctions of junctions
In This Issue In This Issue Conjunctions of junctions ike tight junctions in vertebrates, the ladder-like septate junctions found in most invertebrates act as barriers to epithelial permeability. A pair of papers L The ␣ subunit of a pump (the Na ϩ /K ϩ ATPase) is found at the barrier-forming septate junctions in flies. esides allowing ions to flow between adjacent cells, gap junctions selectiv...
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Flux compactifications of string theory exhibiting the possibility of discretely tuning the cosmological constant to small values have been constructed. The highly tuned vacua in this discretuum have curvature radii which scale as large powers of the flux quantum numbers, exponential in the number of cycles in the compactification. By the arguments of Susskind/Witten (in the AdS case) and Gibbo...
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I shall argue in this paper that it should.1 To begin with, I shall defend (CP) against several criticisms that have been launched against it. These criticisms are of two kinds, which I shall call internal and external respectively. Internal objections are that a theory that includes (CP) fails to give an account of what it is rational to believe that is satisfactory by its own standards. In pa...
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Many existing global constraints can be encoded as a conjunction of among constraints. An among constraint holds if the number of the variables in its scope whose value belongs to a prespecified set, which we call its range, is within some given bounds. It is known that domain filtering algorithms can benefit from reasoning about the interaction of among constraints so that values can be filter...
متن کاملLearning Disjunction of Conjunctions
The quest ion of whether concepts expressible as d is junc t ions of conjunct ions can be learned from examples in polynomial t ime is i nves t i ga ted . Pos i t i ve resu l t s are shown fo r s i g n i f i c a n t sub classes tha t a l low not only p ropos i t i ona l p re d icates but also some r e l a t i o n s . The algori thms are extended so as to be provably t o l e ran t to a ce r t...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 2003
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb1615iti1