Báo cáo toán học: "Thin Lehman Matrices and Their Graphs" docx

... Lehman matrices are the thin Lehman matrices and the point-line incidence matrices of nondegenerate finite projective planes. We would like to know if there are any other infinite families of Lehman ... finite nondegenerate projective planes, a widely studied topic [4], and thin Lehman matrices. Thin Lehman matrices were defined and studied by Cornu´ejols et al. [3]. the...

Ngày tải lên: 08/08/2014, 12:23

... two vertices v  and v  and a connecting edge e v , and attaching each edge end incident to V to one of v  or v  , at will, so that a circle C in the splitting is balanced if and only if it is ... A graph separately gained and signed. signed and biased graph biased, signed graph [signed, biased graph] Notation: (Γ,σ,B), (Σ, B), (Ω,σ) • A graph separately signed and biased....

Ngày tải lên: 07/08/2014, 05:23

... like to thank Persi Diaconis and Susan Holmes for their guidance, encouragement and many helpful comments, and Antonio Ramirez, Veronique Godin and the reviewer for their helpful comments. This ... APE (Analysis of Phylogeny and Evolution [14]) because it provides a unique and compact representation of a cladogram, and in a fast-mixing random walk on cladograms [6]. While si...

Ngày tải lên: 08/08/2014, 12:22

... covariance matrices and their inverses for models allowing dominance and inbreeding SP Smith A Mäki-Tanila* Animal Genetics and Breeding Unit, University of New England, Armidade, NSW ... rows and then deleting the first n rows and columns. The resulting matrix is some permutation of a block diagonal matrix involving 2 by 2 matrices: and 1...

Ngày tải lên: 14/08/2014, 20:20

... Lemma 1 implies that y and z are the roots of graphs of A in G −{e 1 ,e 2 }.LetL and L  be the graph with root in y and z, respectively. By Lemma 14 and Lemma 15 we have that L and L  are isomorphic ... in L, which have degree 2 and 3 in L, respectively (others than z). Similarly there are the neighbours z 1 and z 2 of z, which have degree 2 and 3 in L  .Ify 2 = z 2 and...

Ngày tải lên: 07/08/2014, 08:22

... out-neighbours and in-neighbours of v by N + (v) and N − (v) and the cardinalities of these sets by d + (v) and d − (v), respectively. The degree of v in D is defined as deg(v) = d + (v) + d − (v) and the ... Kronk, and D.R. Lick, On detours in graphs, Canad. Math. Bull. 11(2) (1968) 195–201. [21] J.M. Laborde, C. Payan, and N.H. Xuong, Independent sets and longest directed pat...

Ngày tải lên: 07/08/2014, 21:21

... Brualdi, Matrices of zeros and ones with fixed row and column sum vectors, Linear Algebra Appli. 33 :159-231 (1980). [2] R. A. Brualdi and J. G. Sanderson, Nested species subsets, gaps, and discrep- ancy, ... 1999 Abstract Let m and n be positive integers, and let R =(r 1 , ,r m )andS = (s 1 , ,s n ) be non-negative integral vectors. Let A (R, S)bethesetofall m × n (0, 1) -matric...

Ngày tải lên: 07/08/2014, 06:20

... MATHEMATICA. The PDF p C (r) and the CDF F C (r) of the capacity C(t) of N∗Nakagami-m channels are presented in Figures 2 and 3, respectively. Also, the approximation results obtained in (23) and (24) are shown ... values of the fading parameter m n and the numb er of hops N in N∗Nakagami-m channels. In Figures 4 and 5, we have also included the approximations obtained in (25) and...

Ngày tải lên: 20/06/2014, 20:20

... useful and crucial for our following results. Lemma 3.2 Let E be a closed interval on the real line and T : E → E be a con- tinuous and nondecreasing mapping such that F(T ) is nonempty and bounded ... u 1 > u 1 and Tx 1 > x 1 . By using (1.9), (1.11) and the same argument as in Case 1, we can show that x n ≥ u n for all n ≥ 1. We note that x 1 < L and by using (1.11)...

Ngày tải lên: 20/06/2014, 20:20

... suppress the acoustic echo and the noise signal with a single gain based on soft decision. For this, the noise and echo spectral are separately and efficiently estimated and combined by a single ... between the microphone input and the estimate echo, and (2) the cross-correlation coefficient between microphone input and the residual error of the suppressor are computed and used to...

Ngày tải lên: 20/06/2014, 20:20