Báo cáo toán học: "Poset homology of Rees products, and q-Eulerian polynomials" potx

... of the symmetric group on the cohomology of the toric variety associated with the Coxeter complex of S n . Another corollary is a consequence of a refinement of a result of Carlitz, Scoville and ... topology of order complexes and commutative al- gebra in [8], Bj¨orner and Welker introduced the notion of Rees product of posets, which is a combinatorial analog of the...

Ngày tải lên: 08/08/2014, 01:20

... applications of these polynomials, deriving new bounds for the radius of a graph and the “weight k-excess” of a vertex. Generalizing these results, and grouping ideas of Van Dam [10] , and Garriga and ... presence of high levels of structure in the considered graphs. See, for instance, the papers of Haemers and Van Dam, [12] , and Garriga, Yebra, and the author [17...

Ngày tải lên: 07/08/2014, 06:20

Ngày tải lên: 20/06/2014, 21:20

... reached in the event of an average weekly consumption (median value) of, e.g. 1,795 g of chocolate and for children 772 g of chocolate. On the basis of the maximum aluminium content of chocolate, ... a weekly consumption of 467 g and for children of only 201 g. To reach the PTWI value of 70 mg per week (adults) and of 30 mg per week (children), the weekly consump...

Ngày tải lên: 20/06/2014, 21:20

Ngày tải lên: 05/08/2014, 15:20

Ngày tải lên: 05/08/2014, 15:20

Ngày tải lên: 05/08/2014, 15:20

Ngày tải lên: 05/08/2014, 15:21

... oscillation of some object on half-line. The controlling cost at each step is unbounded and is defined by conditional expectation of the cost caused by the number of jumps and of the integral of the ... sequence of the exponentially distributed independent ran- dom variables with the parameter μ n+1 (μ n+1 > 0), and ν μ n+1 (ξ n+1 ) is random variable defined by The Model...

Ngày tải lên: 06/08/2014, 05:20

... can one calculate the Fibonacci length of G×H (external direct product of groups G and H) in terms of the Fibonacci lengths of G and H? For a finite number of the groups G 1 ,G 2 , , G k we use ... result follows.  Proofs of Pr opositions B and C. Let G = a, b, H = c, d and G×H = a, b, c, d where, [a, c]=[a, d]=[b, c]=[b, d]=1. ConsiderG and H as G = a, b, 1, 1...

Ngày tải lên: 06/08/2014, 05:20