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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">dan-384</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>МАТЕМАТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>КВАЛИФИЦИРОВАННЫЕ ОЦЕНКИ ПОГРЕШНОСТИ ПОСЛЕДОВАТЕЛЬНЫХ ПРИБЛИЖЕНИЙ В ТЕОРИИ НЕКОРРЕКТНЫХ ЛИНЕЙНЫХ ЗАДАЧ</article-title><trans-title-group xml:lang="en"><trans-title>QUALIFIED ERROR ESTIMATES OF SUCCESSIVE APPROXIMATIONS IN THEORY OF ILL-POSED LINEAR PROBLEMS</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>Забрейко</surname><given-names>П. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Zabreiko</surname><given-names>P. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д-р физ.-мат. наук, профессор</p></bio><bio xml:lang="en"><p>D. Sc. (Physics and Mathematics), Professor</p></bio><email xlink:type="simple">zabreiko@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Михайлов</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Mikhailov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>аспирант</p></bio><bio xml:lang="en"><p>Postgraduate student</p></bio><email xlink:type="simple">artostby@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>02</day><month>03</month><year>2017</year></pub-date><volume>61</volume><issue>1</issue><fpage>18</fpage><lpage>23</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Забрейко П.П., Михайлов А.В., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Забрейко П.П., Михайлов А.В.</copyright-holder><copyright-holder xml:lang="en">Zabreiko P.P., Mikhailov A.V.</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://doklady.belnauka.by/jour/article/view/384">https://doklady.belnauka.by/jour/article/view/384</self-uri><abstract><p>В сообщении описываются необходимые и достаточные условия на оператор B, ()1,Bρ= при выполнении которых ряд Неймана сходится сильно и затем, на основе этих условий, приводятся некоторые оценки погрешностей для соответствующих последовательных приближений.</p></abstract><trans-abstract xml:lang="en"><p>This article deals with the necessary and sufficient conditions for the operator B, ()1,Bρ= under which the Neumann series converges strongly and on the basis of these conditions, some of the error estimates for the corresponding successive approximations are presented.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>последовательные приближения</kwd><kwd>квазисходимость</kwd><kwd>ряд Неймана</kwd></kwd-group><kwd-group xml:lang="en"><kwd>successive approximations</kwd><kwd>quasiconvergence</kwd><kwd>Neumann series</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Канторович, Л. 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