منابع مشابه
18.S997 Fall 2012 The Polynomial Method: Degree Reduction
(should we prove it?...) If deg(S) is significantly smaller than |S|, then it means that S has more algebraic structure than a generic set. We are going to explore the connection between combinatorial properties of a set S and its algebraic structure. We will see that interesting examples in the kind of incidence geometry questions we have been studying need to have algebraic structure. Once we...
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Minimum Degree and Nested Dissection are the two most popular reordering schemes used to reduce ll-in and operation count when factoring and solving sparse matrices. Most of the state-of-the-art ordering packages hybridize these methods by performing incomplete Nested Dissection and ordering by Minimum Degree the subgraphs associated with the leaves of the separation tree, but to date only loos...
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We show there is a non-recursive r.e. set A such that if W is any low r.e. set, then the join W ⊕ A is also low. That is, A is “almost deep”. This answers a question of Jockusch. The almost deep degrees form an definable ideal in the r.e. degrees (with jump.)
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The global missing baryon problem — that the sum of observed baryons falls short of the number expected form BBN — is well known. In addition to this, there is also a local missing baryon problem that applies to individual dark matter halos. This halo by halo missing baryon problem is such that the observed mass fraction of baryons in individual galaxies falls short of the cosmic baryon fractio...
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ژورنال
عنوان ژورنال: Monthly Weather Review
سال: 1933
ISSN: 0027-0644,1520-0493
DOI: 10.1175/1520-0493(1933)61<327a:adh>2.0.co;2