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Estimates of lengths of shortest nonzero vectors in some lattices. I 一些格中最短非零向量长度的估计。我
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-06-01 DOI: 10.1515/dma-2022-0018
A. S. Rybakov
Abstract In 1988, Friese et al. put forward lower estimates for the lengths of shortest nonzero vectors for “almost all” lattices of some families in the dimension 3. In 2004, the author of the present paper obtained a similar result for the dimension 4. Here we give a better estimate for the cardinality of the set of exceptional lattices for which the above estimates are not valid. In the case of dimension 4 we improve the upper estimate for an arbitrary chosen parameter that controls the accuracy of these lower estimates and for the number of exceptions. In this (first) part of the paper, we also prove some auxiliary results, which will be used in the second (main) part of the paper, in which an analogue of A. Friese et al. result will be given for dimension 5.
摘要1988年,Friese等人对维数为3的一些族的“几乎所有”格的最短非零向量的长度提出了较低的估计。2004年,本论文的作者在维度4上获得了类似的结果。在这里,我们对上述估计无效的异常格集的基数给出了更好的估计。在维度4的情况下,我们改进了任意选择的参数的上限估计,该参数控制了这些下限估计的准确性和异常数量。在论文的这(第一)部分中,我们还证明了一些辅助结果,这些结果将在论文的第二(主要)部分中使用,其中A.Friese等人的结果将在维度5中给出。
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引用次数: 0
Completeness criterion with respect to the enumeration closure operator in the three-valued logic 关于三值逻辑中枚举闭包运算符的完备性准则
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-04-01 DOI: 10.1515/dma-2022-0010
S. Marchenkov, V. A. Prostov
Abstract The enumeration closure operator (the Π-operator) is considered on the set Pk of functions of the k-valued logic. It is proved that, for any k ⩾ 2, any positively precomplete class in Pk is also Π-precomplete. It is also established that there are no other Π-precomplete classes in the three-valued logic.
在k值逻辑的函数集合Pk上考虑了枚举闭包算子Π-operator。证明,对于任何k小于2,Pk中的任何正预完成类也是Π-precomplete。还确定在三值逻辑中不存在其他Π-precomplete类。
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引用次数: 0
Some cardinality estimates for the set of correlation-immune Boolean functions 一组相关免疫布尔函数的基数估计
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-04-01 DOI: 10.1515/dma-2022-0008
E. Karelina
Abstract Estimates for the cardinality of the set of correlation-immune n-ary Boolean functions with fixed weight are obtained.
摘要给出了一组具有固定权值的相关免疫n元布尔函数集的基数估计。
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引用次数: 0
Admissible and Bayes decisions with fuzzy-valued losses 具有模糊值损失的容许和贝叶斯决策
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-04-01 DOI: 10.1515/dma-2022-0013
A. S. Shvedov
Abstract Some results of classical statistical decision theory are generalized by means of the theory of fuzzy sets. The concepts of an admissible decision in the restricted sense, an admissible decision in the broad sense, a Bayes decision in the restricted sense, and a Bayes decision in the broad sense are introduced. It is proved that any Bayes decision in the broad sense with positive prior discrete density is admissible in the restricted sense. The class of Bayes decisions is shown to be complete under certain conditions on the loss function. Problems with a finite set of possible states are considered.
摘要利用模糊集理论推广了经典统计决策理论的一些结果。介绍了受限制的可容许决策、广义的可容许决策、受限制的贝叶斯决策和广义的贝叶斯决策的概念。证明了广义上具有正先验离散密度的贝叶斯决策在有限意义上是可接受的。在损失函数的一定条件下,贝叶斯决策类是完备的。考虑具有有限可能状态集的问题。
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引用次数: 0
Finding periods of Zhegalkin polynomials Zhegalkin多项式的求周期
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-04-01 DOI: 10.1515/dma-2022-0012
S. Selezneva
Abstract A period of a Boolean function f(x1, …, xn) is a binary n-tuple a = (a1, …, an) that satisfies the identity f(x1 + a1, …, xn + an) = f(x1, …, xn). A Boolean function is periodic if it admits a nonzero period. We propose an algorithm that takes the Zhegalkin polynomial of a Boolean function f(x1, …, xn) as the input and finds a basis of the space of all periods of f(x1, …, xn). The complexity of this algorithm is nO(d), where d is the degree of the function f. As a corollary we show that a basis of the space of all periods of a Boolean function specified by the Zhegalkin polynomial of a bounded degree may be found with complexity which is polynomial in the number of variables.
摘要布尔函数f(x1,…,xn)的周期是二进制n元组A=(a1,…,an),它满足恒等式f(x1+a1,…,xn+an)=f(x1,…,xn)。如果布尔函数允许一个非零周期,那么它就是周期函数。我们提出了一种算法,该算法以布尔函数f(x1,…,xn)的Zhegalkin多项式为输入,并找到f(x1、…、xn)所有周期的空间的基。该算法的复杂度为nO(d),其中d是函数f的次数。作为推论,我们证明了由有界次数的Zhegalkin多项式指定的布尔函数的所有周期的空间的基可以被找到,其复杂度是变量数量的多项式。
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引用次数: 0
Some families of closed classes in Pk defined by additive formulas 由加性公式定义的Pk中闭类的一些族
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-04-01 DOI: 10.1515/dma-2022-0011
D. G. Meshchaninov
Abstract We analyse closed classes in k-valued logics containing all linear functions modulo k. The classes are determined by divisors d of a number k and canonical formulas for functions. We construct the lattice of all such classes for k = p2, where p is a prime, and construct fragments of the lattice for other composite k.
本文分析了k值逻辑中包含所有以k为模的线性函数的闭类。这些闭类由数k的除数d和函数的正则公式决定。对于k = p2,我们构造了所有这类的格,其中p是素数,并构造了其他复合k的格片段。
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引用次数: 0
Continuality of classes of functions in multivalued logic with minimal logarithmic growth rate 具有最小对数增长率的多值逻辑中函数类的连续性
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-04-01 DOI: 10.1515/dma-2022-0009
Stepan Alekseevich Komkov
Abstract We show that in multivalued logic there exist a continual family of pairwise incomparable closed sets with minimal logarithmic growth rate and a continual chain of nested closed sets with minimal logarithmic growth rate. As a corollary we prove that any subset-preserving class in multivalued logic contains a continual chain of nested closed sets and a continual family of pairwise incomparable closed sets such that none of the sets is a subset of any other precomplete class.
摘要我们证明了在多值逻辑中存在具有最小对数增长率的成对不可比闭集的连续族和具有最小对数生长率的嵌套闭集的持续链。作为推论,我们证明了多值逻辑中任何保留子集的类都包含嵌套闭集的连续链和成对不可比闭集的持续族,使得这些集都不是任何其他预完备类的子集。
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引用次数: 0
The site-perimeter of compositions 作品的场地周界
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-04-01 DOI: 10.1515/dma-2022-0007
A. Blecher, C. Brennan, A. Knopfmacher
Abstract Compositions of n are finite sequences of positive integers (σi)i=1k $begin{array}{} (sigma_i)_{i = 1}^k end{array} $ such that σ1+σ2+⋯+σk=n. $$begin{array}{} sigma_1+sigma_2+cdots +sigma_k = n. end{array} $$ We represent a composition of n as a bargraph with area n such that the height of the i-th column of the bargraph equals the size of the i-th part of the composition. We consider the site-perimeter which is the number of nearest-neighbour cells outside the boundary of the polyomino. The generating function that counts the total site-perimeter of compositions is obtained. In addition, we rederive the average site-perimeter of a composition by direct counting. Finally we determine the average site-perimeter of a bargraph with a given semi-perimeter.
n的组合是正整数(σi)i=1k $begin{array}{} (sigma_i)_{i = 1}^k end{array} $的有限序列,使得σ1+σ2+⋯+σk=n。$$begin{array}{} sigma_1+sigma_2+cdots +sigma_k = n. end{array} $$我们将n的组合表示为面积为n的柱状图,使得柱状图的第i列的高度等于组合的第i部分的大小。我们考虑场地周长,即多聚体边界外最近邻细胞的数量。得到了计算组合物总场地周长的生成函数。此外,我们通过直接计数重新推导出一个组合的平均场地周长。最后,我们确定了具有给定半周长的柱状图的平均点周长。
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引用次数: 0
Variance of the number of cycles of random A-permutation 随机a置换的循环数的方差
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-02-01 DOI: 10.1515/dma-2022-0005
A. L. Yakymiv
Abstract We consider random permutations having uniform distribution on the set of all permutations of the n-element set with lengths of cycles belonging to a fixed set A (so-called A-permutations). For some class of sets A the asymptotic formula for the variance of the number of cycles of such permutations is obtained.
我们考虑在n元素集合的所有排列的集合上具有均匀分布的随机排列,其周期长度属于一个固定集合a(所谓的a -置换)。对于某类集合A,得到了这种排列的循环数方差的渐近公式。
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引用次数: 3
A family of asymptotically independent statistics in polynomial scheme containing the Pearson statistic 包含Pearson统计量的多项式格式中的一类渐近独立统计量
IF 0.5 Q4 MATHEMATICS, APPLIED Pub Date : 2022-02-01 DOI: 10.1515/dma-2022-0003
M. P. Savelov
Abstract We consider a polynomial scheme with N outcomes. The Pearson statistic is the classical one for testing the hypothesis that the probabilities of outcomes are given by the numbers p1, …, pN. We suggest a couple of N − 2 statistics which along with the Pearson statistics constitute a set of N − 1 asymptotically jointly independent random variables, and find their limit distributions. The Pearson statistics is the square of the length of asymptotically normal random vector. The suggested statistics are coordinates of this vector in some auxiliary spherical coordinate system.
摘要我们考虑一个具有N个结果的多项式格式。Pearson统计量是检验结果概率由数字p1,…,pN给出的假设的经典统计量。我们提出了两个N−2统计量,它们与Pearson统计学一起构成了一组N−1渐近联合独立的随机变量,并找到了它们的极限分布。皮尔逊统计量是渐近正态随机向量长度的平方。建议的统计量是该向量在一些辅助球面坐标系中的坐标。
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引用次数: 0
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Discrete Mathematics and Applications
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