Báo cáo toán học: "New upper bound for a class of vertex Folkman numbers" pptx

... New upper bound for a class of vertex Folkman numbers N. Kolev Department of Algebra Faculty of Mathematics and Informatics “St. Kl. Ohridski” University of So a 5 J. Bourchier blvd, 1164 So a BULGARIA N. ... ≥ max {a 1 , ,a r }. Folkman [3] proved that there exists a graph G such that G → (a 1 , ,a r )andcl(G)=max {a 1 , ,a r }. Therefore F (a 1 , ,a r ; q...

Ngày tải lên: 07/08/2014, 13:21

... permutation characters of S n are available on programs as Magma [5] or GAP [13]. Using the “linprog” ro utine of Matlab [14], we obtain the bounds in Table 1. Note that the linear programming ... M. Deza and P. Frankl. On the maximum number of permutations with given max- imal or minimal distance. Journal of Combinatorial Theory (A) , 22:352–360, 1977. [11] Michael Deza and Tayuan Hu...

Ngày tải lên: 08/08/2014, 12:22

... the article as it appeared upon acceptance. Fully formatted PDF and full text (HTML) versions will be made available soon. Lyapunov-type inequalities for a class of even-order differential equations Journal ... Lyapunov-typ e inequalities for certain higher order differential equations. J. Math. Anal. Appl. 195 , 527–536 (1995) [9] Tang, XH, Zhang, M: Lyapunov inequalities and stabil...

Ngày tải lên: 20/06/2014, 21:20

... of Gda´nsk, Wita Stwosza 57, 80-952 Gda´nsk, Poland. tdz@math.univ.gda.pl Andrzej Nowik † Institute of Mathematics, University of Gda´nsk, Wita Stwosza 57, 80-952 Gda´nsk, Poland. nowik@manta.univ.gda.pl Piotr ... a number of corrections. References [1] Chv´atal, V., Harary, F.: Generalized Ramsey theory for graphs. I. Diagonal numbers, Periodica Mathematica Hungarica, 3 (1973) 11...

Ngày tải lên: 07/08/2014, 08:22

... Sciences University of Delaware, Newark, DE 19716, USA; fellaz@math.udel.edu V. A. USTIMENKO Department of Mathematics and Mechanics University of Kiev, Kiev 252127, Ukraine; vau@trion.kiev.ua A. J. WOLDAR Department ... A. J. Woldar was additionally supported by a Villanova University Faculty Research Grant. V .A. Ustimenko was addition- ally supported in part by INTAS-93-2530 and...

Ngày tải lên: 07/08/2014, 06:22

... 125, Almaty, Kazakhstan askar56@hotmail.com Submitted: Mar 29, 2009; Accepted: Feb 18, 2010; Published: Feb 28, 2010 Mathematics Subject Classification: 0 5A0 5, 0 5A1 5 Abstract We show that the major ... by r[max, i](σ) the set of all right-maximal indices of σ, and let r[max, v](σ) denote the set of all right-maximal values. Note that any right-maximal index is a descent index. In o...

Ngày tải lên: 08/08/2014, 12:22

... Math Anal Appl. 352, 99–111 (2009). doi:10.1016/j.jmaa.2008.06.021 16. Kang, D: Solution of the quasilinear elliptic problem with a critical Sobolev-Hardy exponent and a Hardy term. J Math Anal ... solutions for all λ ∈ (0, q p  1 (0)) . Remark 1.4 As Ω is a bounded smooth domain and p =2,the results of Theorems 1.1, 1.2 are improvements of the main results of [18]. Remark 1....

Ngày tải lên: 20/06/2014, 22:20

... many applications such as mathematical finance, differential games, economics, and so on. The solvability of system (1.1), a n ontrivial generalization of s ystem (1.2), as far as I know, only a ... (1.1)hasauniquesolutionon [a, b] under assumptions (A1 ), (A2 ), and (A3 ). Existence. ThesameargumentastheproofofTheorem 3.3. 6 Boundary Value Problems Case 2 (α 1 = 0andα 2 > 0). Apply...

Ngày tải lên: 21/06/2014, 22:20

... Lower Bound Formulas for Multicolored Ramsey Numbers Aaron Robertson Department of Mathematics Colgate University, Hamilton, NY 13346 aaron@math.colgate.edu Submitted: July 26, 2001; Accepted: March ... the phrase diagonal of X,whereX = A, A  ,B,B  , or C,tomean the diagonal of X when X is viewed as a matrix by itself. Note 2: For ease of reading, we will use (i, j) to re...

Ngày tải lên: 07/08/2014, 06:23