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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">mais</journal-id><journal-title-group><journal-title xml:lang="ru">Моделирование и анализ информационных систем</journal-title><trans-title-group xml:lang="en"><trans-title>Modeling and Analysis of Information Systems</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1818-1015</issn><issn pub-type="epub">2313-5417</issn><publisher><publisher-name>Yaroslavl State University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18255/1818-1015-2012-2-109-114</article-id><article-id custom-type="elpub" pub-id-type="custom">mais-22</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Оригинальные статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Шары в пространствах последовательностей</article-title><trans-title-group xml:lang="en"><trans-title>Balls in Sequence Spaces</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тимофеев</surname><given-names>Евгений Александрович</given-names></name><name name-style="western" xml:lang="en"><surname>Timofeev</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор кафедры теоретической информатики</p></bio><bio xml:lang="en"><p>доктор физико-математических наук, профессор кафедры теоретической информатики</p></bio><email xlink:type="simple">timofeevea@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Ярославский государственный университет им. П.Г. Демидова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ярославский государственный университет им. П.Г. Демидова</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2012</year></pub-date><pub-date pub-type="epub"><day>25</day><month>02</month><year>2015</year></pub-date><volume>19</volume><issue>2</issue><fpage>109</fpage><lpage>114</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Тимофеев Е.А., 2015</copyright-statement><copyright-year>2015</copyright-year><copyright-holder xml:lang="ru">Тимофеев Е.А.</copyright-holder><copyright-holder xml:lang="en">Timofeev E.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.mais-journal.ru/jour/article/view/22">https://www.mais-journal.ru/jour/article/view/22</self-uri><abstract><p>Предлагается новая метрика на пространстве правосторонних бесконечных последовательностей над конечным алфавитом. Введенная в задаче оценивания энтропии дискретных стационарных процессов, эта метрика обладает рядом интересных свойств. Например, мера шара является разрывной при любом двоично-рациональном значении log r, где r – радиус шара.</p></abstract><trans-abstract xml:lang="en"><p>We introduce a new metric on a space of right-sided infinite sequences drawn from a finite alphabet. Emerging from a problem of entropy estimation of a discrete stationary ergodic process, the metric is important on its own part and exhibits some interesting properties. For example, the measure of a ball is discontinuous at every binary rational value of log r, where r is the radius.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>энтропия</kwd><kwd>непараметрическая оценка</kwd><kwd>шар</kwd><kwd>мера Бернулли</kwd></kwd-group><kwd-group xml:lang="en"><kwd>entropy</kwd><kwd>nonparametric statistic</kwd><kwd>ball</kwd><kwd>Bernoulli's measure</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">грант Правительства РФ</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Deza M., Deza T. Encyclopedia of Distances, Springer, 2009.</mixed-citation><mixed-citation xml:lang="en">Deza M., Deza T. Encyclopedia of Distances, Springer, 2009.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Grassberger P. 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