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arXiv 0707.2173math.CO
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具有两个基块且v <= 50的循环(v;r,s;lambda)差分族

Cyclic (v;r,s;lambda) difference families with two base blocks and v <= 50

Dragomir Z. Djokovic

摘要:

我们构造了许多新的循环(v;r,s;lambda)差族,其中v小于或等于50。特别地,我们构造了带参数的差分族(45; 18,10;9),(45; 22,22;21),(47; 21,12;12),(47; 19,15;12),(47; 22,14;14),(48; 20,10;10),(48; 24,4;12),(50; 25,20;20),其中存在问题是一个开放的问题。(45)22,22; 21)差分族给出了一个参数为v=45,b=90,r=44,k=22和lambda=21的BIBD,而参数为(50; 25,20;20)的BIBD给出了一对长度为50的二进制序列,其周期自相关函数为零(Golay对的周期模拟)。我们还构造了九个新的D最优设计。提出了循环差分族的一个标准形,并有效地用于编制已知和新差分族的列表。

英文摘要:

We construct many new cyclic (v;r,s;lambda) difference families with v less than or equal 50. In particular we construct the difference families with parameters (45;18,10;9), (45;22,22;21), (47;21,12;12), (47;19,15;12), (47;22,14;14), (48;20,10;10), (48;24,4;12), (50;25,20;20) for which the existence question was an open problem. The (45;22,22;21) difference family gives a BIBD with parameters v=45, b=90, r=44, k=22 and lambda=21, and the one with parameters (50;25,20;20) gives a pair of binary sequences of length 50 with zero periodic autocorrelation function (the periodic analog of a Golay pair). We also construct nine new D-optimal designs. A normal form for cyclic difference families is proposed and used effectively in compiling the list of known and new difference families.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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