supported by National Natural Science Foundation of China(Grant No.11071163);Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20110073120068);Education Department of Henan Province(Grant No.14A110026)
In this paper, a bivariate generating function CF(x, y) =f(x)-yf(xy)1-yis investigated, where f(x)= n 0fnxnis a generating function satisfying the functional equation f(x) = 1 + r j=1 m i=j-1aij xif(x)j.In particular,...
supported by National Natural Science Foundation of China(Grant No.11071163);Doctor Fund of Shandong Province(Grant No.BS2009SF017)
In this paper,we calculate the number of the codewords(with Hamming weight 7)of each type in the Preparata codes over Z4,then give the parameter sets of 3-designs constructed from the supports of the codewords of each...
Supported by the National Natural Science Foundation of China (Grant No.11071163)
Let Kn be a complete graph on n vertices. In this paper, we find the necessary conditions for the existence of a 6-cycle system of Kn - L for every nearly 2-regular leave L of Kn. This condition is also sufficient whe...
Supported by the National Natural Science Foundation of China (Grant No. 11071163)
In this paper, we extend the result of packing the complete graph Kv with 6-cycles (hexagons). Mainly, the maximum packing of Kv - F is obtained where the leave is an odd spanning forest.