Báo cáo toán học: "On the symmetry of the distribution of k-crossings and k-nestings in graphs" pot

Báo cáo toán học: "On an identity for the cycle indices of rooted tree automorphism groups" doc

Báo cáo toán học: "On an identity for the cycle indices of rooted tree automorphism groups" doc

... (the component the electronic journal of combinatorics 13 (2006), #N14 5 2 Proof of the main theorem By the recursive structure of rooted trees and the multiplicative properties of the cycle index, ... related to the automorphism groups of trees have been investigated. We state, for instance, the enumeration of identity trees (see [7]), and the question of d...
Ngày tải lên : 07/08/2014, 13:21
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Báo cáo toán học: "On two problems regarding the Hamiltonian cycle game" ppsx

Báo cáo toán học: "On two problems regarding the Hamiltonian cycle game" ppsx

... endpoint of one of his paths and the electronic journal of combinatorics 16 (2009), #R28 12 Following [2], we define τ(H n ) to be the minimum number of moves needed for Maker in order to win H n (it ... K n which is induced on the vertices of B k (S). Let G k (S) be the subgraph of G  k (S) which is obtained by removing all edges (x, y) such that x and y are endpoin...
Ngày tải lên : 07/08/2014, 21:21
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Báo cáo toán học: "On a conjecture concerning the Petersen graph" ppt

Báo cáo toán học: "On a conjecture concerning the Petersen graph" ppt

... and there exist two induced paths in H joining x and y one of which is of odd length at least 3 and the other of even length at least 2. Lemma 2.1: Let G be a 3-connected graph of girth five in ... .5(iii) there exist induced paths of length 3 and 4 joining x i and x k , both avoiding x j . Now arguing just as in the proof of Lemma 5.2, again we conclude that B...
Ngày tải lên : 08/08/2014, 12:23
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Báo cáo toán học: "On Rowland’s sequence Fernando Chamizo, Dulcinea Raboso and Seraf" ppsx

Báo cáo toán học: "On Rowland’s sequence Fernando Chamizo, Dulcinea Raboso and Seraf" ppsx

... referee f or the careful reading, the help to improve the exposition and the intriguing questions. We thank Ang´elica Benito for the reading of the manuscript and her suggestions. The first author ... are a version of the ‘shortcut’ mentioned in [4]. Before giving the actual definitions we motivate them including here a very simple proof of Theorem 1.1 in a stron...
Ngày tải lên : 08/08/2014, 14:23
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Báo cáo toán học: "On the symmetry of the distribution of k-crossings and k-nestings in graphs" pot

Báo cáo toán học: "On the symmetry of the distribution of k-crossings and k-nestings in graphs" pot

... ∗, se = k), where the ∗ indicates that there is no the electronic journal of combinatorics 13 (2006), #N21 3 On the symmetry of the distribution of k-crossings and k-nestings in graphs Anna de ... c k ) is in the diagram. We are interested in counting fillings where the sum of the entries is fixed. Let N(F ; m; ne = k, se = l) be the number of arbitrary...
Ngày tải lên : 07/08/2014, 13:21
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Báo cáo toán học: " On the first- and second-order statistics of the capacity " ppt

Báo cáo toán học: " On the first- and second-order statistics of the capacity " ppt

... levels r. Furthermore, the variance of the channel capacity decreases by increasing the number of hops, while increase in the severity of fading has an opposite in uence on the variance of the channel ... associated with the nth link of the multihop communication system. Increasing the value of m n decreases the severity of fading and vice versa. The o...
Ngày tải lên : 20/06/2014, 20:20
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Báo cáo toán học: " On the boundedness of the solutions in nonlinear discrete Volterra difference equations" pot

Báo cáo toán học: " On the boundedness of the solutions in nonlinear discrete Volterra difference equations" pot

... > 0, and φ(0) = 0 where . is any fixed norm on R d . In recent years, there has been an increasing interest in the study of the asymptotic behavior of the solutions of both convolution and non-convolution-type ... in general is non-trivial. The main result on the boundedness of solutions of a linear Volterra difference system in [2] was improved by Gy˝ori a...
Ngày tải lên : 20/06/2014, 20:20
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