共查询到20条相似文献,搜索用时 265 毫秒
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Filip Cools 《代数通讯》2013,41(8):2600-2610
We give a rough characterization for n-dimensional varieties with Gk?1,k-defect equal to a > 0 if k ≥ n. Then we apply this in the case that a ≥ n ? 2 to become a fine classification. 相似文献
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Marco Buratti 《Designs, Codes and Cryptography》1997,11(1):5-9
Given a subgroup N of an additive group G, a (G,N,k,1) difference family (DF) is a set D of k-subsets of G such that (d – d | d, d D, d d, D D) = G – N. Generalizing a construction by Genma, Jimbo, and Mishima [4], we give a new condition for realizing a (Ck G, Ck × {0}, k, 1)-DF starting from a (G, {0}, k, 1)-DF. Among the consequences, new cyclic Steiner 2-designs are obtained. 相似文献
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解方程 sin5x=sin4x。解法一:因为与a有相同的正弦值的弧度数x的集合是{x|x=kπ (-1)~ka,k∈Z},所以原方程可以化成 5x=kπ (-1)4x (k∈Z) 解之得:x=kπ/5 (-1)~(k 1) 所以原方程的解集是{x|2= 解法二:原方程等价为sin4x=sin5x,m同解法一得:4x=kπ (-1)~k5x 解之得:x=kπ/4 (-1)~(k 1)5(k∈z) 相似文献
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《Journal of Computational and Applied Mathematics》1998,88(1):57-69
For 1 ⩽k⩽n − 1 and 0 ⩽q⩽k − 1, solutions are obtained for the boundary value problem, (−1)n−k = f(x,y), y(i)=0, 0⩽i⩽k − 1, and y(i) = 0, q⩽j⩽n − k + q − 1, where f(x,y) is singular at y = 0. An application is made of a fixed point theorem for operators that are decreasing with respect to a cone. 相似文献
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本文考虑空间 (k1,k2 ) -拟正则映射的 Lp(p >n)可积性 ,以及当 k1→ 1 ,k2 → 0时 p的渐近行为 . 相似文献
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N. N. Kuzyurin 《Mathematical Notes》1977,21(4):316-320
This paper studies the asymptotic behavior of functions M(n, k, k–1, ) and m(n, k, k–1, ), equal to the respective cardinalities of the minimal -covering and maximal -packing of all (k–1)-subsets of the n-element set of its k-subsets. It is shown that, if sequence k=k(n) is such that k(n)/n 0 as then m(n, k, k–1, ).(
k–1
n
).k1, and if
as n , thenM(n,k,k–1,).(
k–1
n
).k–1. A consequence of these results is the validity of the Erdös-Hanani conjecture concerning the asymptotic behavior of functions M(n, k, k–1, 1) and m(n, k, k–1, 1).Translated from Matematicheskie Zametki, Vol. 21, No. 4, pp. 565–571, April, 1977.In conclusion, the author wishes to thank A. A. Sapozhenko under whose direction the present work was achieved. 相似文献
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This paper shows that the graphW(n, n – 2, k) is chromatically unique for any even integern 6 and any integerk 1. 相似文献
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K_(1,k)-FACTORIZATION OF BIPARTITE GRAPHS 总被引:3,自引:0,他引:3
《高校应用数学学报(英文版)》1997,(4)
K1,k┐FACTORIZATIONOFBIPARTITEGRAPHSDUBEILIANGAbstract.Inthispaper,anecessaryconditionforabipartitegraphλKm,ntobeK1,k-factoriz... 相似文献
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We present some comments on the behavior of solutions of the difference equation
where p
i 0, i = 1,..., k, k N, and x
–k
,..., x
–1 R. 相似文献
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WANG Jian 《高校应用数学学报(英文版)》2008,23(3)
A K1,k-factorization of λKm,n is a set of edge-disjoint K1,k-factors of λKm,n,which partition the set of edges of λKm,n.In this paper,it is proved that a sufficient condition for the existence of K1,k-factorization of λKm,n,whenever k is any positive integer,is that(1) m ≤ kn,(2) n ≤ km,(3) km-n ≡ kn-m ≡ 0(mod(k2-1)) and(4) λ(km-n)(kn-m) ≡ 0(mod k(k -1)(k2 -1)(m n)). 相似文献