Báo cáo toán học: " P -partitions and a multi-parameter Klyachko idempotent" ppsx

... journal of combinat orics 11(2) (2005), #R21 10 P -partitions and a multi-parameter Klyachko idempotent Peter McNamara Instituto Superior T´ecnico Departamento de Matem´atica Avenida Rovisco Pais 1049-001 ... definition naturally makes the Klyachko idem- potent appealing to combinatorialists and, for example, [2, 4, 11, 15] study the Klyachko idempotent and its generalizat...

Ngày tải lên: 07/08/2014, 08:22

... arrangement A of hyperplanes in C n is a finite set of a ne hyperplanes in complex n-space. To each arrangement A corresponds an n-dimensional complex manifold M A = C n \  H A H.ThespaceM A is called ... an arrangement of hyperplanes in C n that generalizes the classical braid arrangement. The arrangement plays in important role in the work of Schechtman & Varchenko [12, Part...

Ngày tải lên: 07/08/2014, 06:20

... determinant has an interpretation in terms of nonintersect- ing lattice paths. By a lattice path we mean a lattice path in the plane consisting of unit horizontal and vertical steps in the positive ... (4.1) for integral x and y. (On the side, we remark that E(x, y; n) would also make sense for complex x and y if the factorials are interpreted as the appropriate gamma functions. Pro...

Ngày tải lên: 07/08/2014, 06:20

... if they are parallel to the same λ parallel classes. It is well known and easy to prove that a line L has at most m points; and L has exactly m points if and only if each block not parallel to ... contains L or misses L.) A parallel class is parallel to L if some (and hence every) block in it is parallel to L. Thus a line is parallel to exactly λ parallel classes. We say two line...

Ngày tải lên: 07/08/2014, 06:22

... Oellermann and Swart [8] motivated the concept of total distance domination in graphs which finds applications in many situations and structures which give rise to graphs. For a comprehensive treatment ... v, u v and w by adding at most 2(k − 1) vertices to I ∪ B. Set I := I − {v} and L := L − {v} and repeat Step 3. Note that after completing Step 3 the sets I and L are empty an...

Ngày tải lên: 07/08/2014, 15:22

... va r ia nce of ξ n,k equals p k (1 p k ). Hence the random variable ξ n , namely, the number of type B excedances in a random type B derangement on [n], can be represented as a sum of independent ... Clark, Central and local limit theorems for excedances by conjugacy class and by derangement, Integers 2 (200 2), Paper A3 . [10] D. Foata and M .P. Sch¨utzenberger, Th´eorie g´eom´...

Ngày tải lên: 08/08/2014, 01:20

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Ngày tải lên: 05/08/2014, 10:20

... Open Access Including emergency and acute care as a global health priority Nicholas Risko 1* , Emilie JB Calvello 2 , Sarah Stewart de Ramirez 3 , Mayur Narayan 4 and Jon Mark Hirshon 5 Abstract A ... it appears that acute care was once again crowded off the agenda. The recently released UN Report of the Secretary- General on the preventio n and control of NCDs [1] aggressively atta...

Ngày tải lên: 20/06/2014, 21:20

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Ngày tải lên: 05/08/2014, 15:20

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Ngày tải lên: 05/08/2014, 15:21