<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<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">cheb</journal-id><journal-title-group><journal-title xml:lang="ru">Чебышевский сборник</journal-title><trans-title-group xml:lang="en"><trans-title>Chebyshevskii Sbornik</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-8383</issn><publisher><publisher-name>Tula State Lev Tolstoy  Pedagogical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22405/2226-8383-2023-24-3-26-41</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1550</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>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Решение задачи частичного хеджирования через двойственную задачу</article-title><trans-title-group xml:lang="en"><trans-title>Solving the problem of partial hedging through a dual problem</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>Лещенко</surname><given-names>Сергей Сергеевич</given-names></name><name name-style="western" xml:lang="en"><surname>Leshchenko</surname><given-names>Sergey Sergeevich</given-names></name></name-alternatives><email xlink:type="simple">sslsystemup@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Специализированный учебно-научный центр – школа- интернат им. А. Н. Колмогорова Московского государственного университета&#13;
им. М. В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Specialized Educational and Scientific Center – A. N. Kolmogorov boarding School of Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>03</day><month>11</month><year>2023</year></pub-date><volume>24</volume><issue>3</issue><fpage>26</fpage><lpage>41</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Лещенко С.С., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Лещенко С.С.</copyright-holder><copyright-holder xml:lang="en">Leshchenko S.S.</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.chebsbornik.ru/jour/article/view/1550">https://www.chebsbornik.ru/jour/article/view/1550</self-uri><abstract><p>В статье рассматривается задача частичного хеджирования, изучавшаяся в работе [<xref ref-type="bibr" rid="cit20">20</xref>]. В ней оценивается риск дефицита с использованием выпуклого функционала потерь 𝐿(·).В нашей работе мы формулируем двойственную задачу, отличную от двойственной задачи в [<xref ref-type="bibr" rid="cit20">20</xref>], доказываем отсутствие разрыва двойственности, а также существование решения исходной и двойственной задач. Кроме этого, мы получаем результаты статьи [<xref ref-type="bibr" rid="cit20">20</xref>] при более слабых предположениях, используя подход, связанный с применением теорем выпуклого анализа.</p></abstract><trans-abstract xml:lang="en"><p>In this paper we consider the problem of partial hedging studied in [<xref ref-type="bibr" rid="cit20">20</xref>]. In this problem, the risk of shortfall is estimated using a robust convex loss functional 𝐿(·). In our work, we formulate a dual problem different from the dual problem in [<xref ref-type="bibr" rid="cit20">20</xref>], we prove the absence of aduality gap, and also the existence of a solution to the primal and dual problems. In addition, we obtain the results of [<xref ref-type="bibr" rid="cit20">20</xref>] under weaker assumptions using an approach related to the application of theorems of convex analysis.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>выпуклая двойственность</kwd><kwd>выпуклые меры риска</kwd><kwd>функционал потерь</kwd><kwd>частичное хеджирование.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>convex duality</kwd><kwd>real-valued convex risk measures</kwd><kwd>robust loss functionals</kwd><kwd>partial hedging.</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">Attouch H., Br´ezis H. Duality for the sum of convex functions in general banach spaces // Aspects of mathematics and its applications. 1986. Vol. 34. P. 125-133.</mixed-citation><mixed-citation xml:lang="en">Attouch H., Br´ezis H. 1986, “Duality for the sum of convex functions in general banach spaces“, Aspects of mathematics and its applications, vol. 34, pp. 125-133.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Brannath W., Schachermayer W. A Bipolar Theorem for Subsets of 𝐿+ 0 (Ω,ℱ,P) // S´eminaire de Probabilit´es XXXIII. Lecture Notes in Mathematics. 1999. Vol 1709. P. 349-354.</mixed-citation><mixed-citation xml:lang="en">Brannath W., Schachermayer W. 1999, “A Bipolar Theorem for Subsets of 𝐿+ 0 (Ω,ℱ,P)“,</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Cheridito P., Li T. Risk measures on Orlicz hearts // Mathematical Finance. 2009. Vol. 19, №2. P. 189-214.</mixed-citation><mixed-citation xml:lang="en">S´eminaire de Probabilit´es XXXIII. Lecture Notes in Mathematics, vol. 1709, pp. 349-354.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Delbaen F., Schachermayer W. The Mathematics of Arbitrage. Springer, Berlin, Heidelberg. 2006. P. 371.</mixed-citation><mixed-citation xml:lang="en">Cheridito P., Li T. 2009, “Risk measures on Orlicz hearts“, Mathematical Finance, vol. 19, no. 2, pp. 189-214.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">F¨ollmer H., Leukert P. Efficient hedging: Cost versus shortfall risk // Finance &amp; Stochastics, 2000. Vol. 4, №2, P. 117-146.</mixed-citation><mixed-citation xml:lang="en">Delbaen F., Schachermayer W. 2006, “The Mathematics of Arbitrage“, Springer, Berlin, Heidelberg, pp. 371.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Gushchin A. A. A characterization of maximin tests for two composite hypotheses // Mathematical Methods of Statistics, 2015, Vol. 24, №2. P. 110-121.</mixed-citation><mixed-citation xml:lang="en">F¨ollmer H., Leukert P. 2000, “Efficient hedging: Cost versus shortfall risk“, Finance &amp; Stochastics, vol. 4, no. 2, pp. 117-146.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Gushchin A. A., Mordecki E. Bounds on option prices for semimartingale market models // Proceedings of the Steklov Institute of Mathematics. 2002. Vol. 237. P. 73-113.</mixed-citation><mixed-citation xml:lang="en">Gushchin A. A. 2015, “A characterization of maximin tests for two composite hypotheses“, Mathematical Methods of Statistics, vol. 24, no. 2, pp. 110-121.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Gushchin A. A., Leshchenko S. S. Testing hypotheses for measures with different masses: Four optimization problems // Theory Probab. Math. Stat. 2020. Vol. 101. P. 109–117.</mixed-citation><mixed-citation xml:lang="en">Gushchin A. A., Mordecki E. 2002, “Bounds on option prices for semimartingale market models“, Proceedings of the Steklov Institute of Mathematics, vol. 237, pp. 73-113.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Hern´andez-Hern´andez D., Trevi˜no-Aguilar E. Efficient hedging of European options with robust convex loss functionals: A dual-representation formula // Mathematical Finance. 2011. Vol. 21, №1. P. 99-115.</mixed-citation><mixed-citation xml:lang="en">Gushchin A. A., Leshchenko S. S. 2020, “Testing hypotheses for measures with different masses: Four optimization problems“, Theory Probab. Math. Stat., vol. 101, pp. 109–117.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Kirch M. Efficient Hedging in Incomplete Markets under Model Uncertainty. PhD thesis, Humboldt Universitat zu Berlin. 2002. P. 144.</mixed-citation><mixed-citation xml:lang="en">Hern´andez-Hern´andez D., Trevi˜no-Aguilar E. 2011, “Efficient hedging of European options with robust convex loss functionals: A dual-representation formula“, Mathematical Finance, vol. 21, no. 1, pp. 99-115.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Kozek A. Convex Integral Functionals on Orlicz Spaces // Annales Societatis Mathematicae Polonae. Series I: Commentationes Mathematicae. 1979. Vol. 21. P. 109-135.</mixed-citation><mixed-citation xml:lang="en">Kirch M. 2002, “Efficient Hedging in Incomplete Markets under Model Uncertainty“, PhD thesis, Humboldt Universitat zu Berlin, pp. 144.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Nakano Y. Minimizing coherent risk measures of shortfall in discrete-time models under cone constraints // Applied Mathematical Finance. 2003. Vol. 10, №2. P. 163-181.</mixed-citation><mixed-citation xml:lang="en">Kozek A. 1979, “Convex Integral Functionals on Orlicz Spaces“, Annales Societatis Mathematicae Polonae. Series I: Commentationes Mathematicae, vol. 21, pp. 109-135.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Nakano Y. Efficient hedging with coherent risk measure // Journal of Mathematical Analysis and Applications. 2004. Vol.293, №1. P. 345-354.</mixed-citation><mixed-citation xml:lang="en">Nakano Y. 2003, “Minimizing coherent risk measures of shortfall in discrete-time models under cone constraints“, Applied Mathematical Finance, vol. 10, no. 2, pp. 163-181.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Nakano Y. Partial hedging for defaultable claims // Advances in Mathematical Economics. 2011. Vol. 14. P. 127-145.</mixed-citation><mixed-citation xml:lang="en">Nakano Y. 2004, “Efficient hedging with coherent risk measure“, Journal of Mathematical Analysis and Applications, vol. 293, no. 1, pp. 345-354.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Rudloff B. Convex hedging in incomplete markets // Applied Mathematical Finance. 2007. Vol.14, №5. P. 437-452.</mixed-citation><mixed-citation xml:lang="en">Nakano Y. 2011, “Partial hedging for defaultable claims“, Advances in Mathematical Economics, vol. 14, pp. 127-145.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Rudloff B. Coherent hedging in incomplete markets // Quantitative Finance. 2009. Vol. 9, №2. P. 197-206.</mixed-citation><mixed-citation xml:lang="en">Rudloff B. 2007, “Convex hedging in incomplete markets“, Applied Mathematical Finance, vol. 14, no. 5, pp. 437-452.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Rockafellar R. T. Integrals which are convex functionals, II // Pacific J. Math. 1971. Vol. 39. P. 439-469.</mixed-citation><mixed-citation xml:lang="en">Rudloff B. 2009, “Coherent hedging in incomplete markets“, Quantitative Finance, vol. 9, no. 2, pp. 197-206.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Rockafellar R. T. Integral functionals, normal integrands and measurable selections // Springer, Berlin, Heidelberg, In Nonlinear Operators and the Calculus of Variations. Lecture Notes in Mathematics. 1976. Vol 543. P. 157-207.</mixed-citation><mixed-citation xml:lang="en">Rockafellar R. T. 1971, “Integrals which are convex functionals, II“, Pacific J. Math, vol. 39, pp. 439-469.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Rockafellar R. T., Wets R. Variational analysis. Springer-Verlag Berlin Heidelberg. 1998. P. 736</mixed-citation><mixed-citation xml:lang="en">Rockafellar R. T. 1976, “Integral functionals, normal integrands and measurable selections“, Springer, Berlin, Heidelberg, In Nonlinear Operators and the Calculus of Variations. Lecture Notes in Mathematics, vol 543, pp. 157-207.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Trevi˜no-Aguilar E. Duality in a problem of static partial hedging under convex constraints // SIAM Journal on Financial Mathematics. 2015. Vol. 6. P. 1152-1170.</mixed-citation><mixed-citation xml:lang="en">Rockafellar R. T., Wets R. 1998, “Variational analysis“, Springer-Verlag Berlin Heidelberg, pp. 736.</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Xu M. Minimizing shortfall risk using duality approach — an application to partial hedging in incomplete markets. PhD thesis, Carnegie Mellon University. 2004. P. 93.</mixed-citation><mixed-citation xml:lang="en">Trevi˜no-Aguilar E. 2015, “Duality in a problem of static partial hedging under convex constraints“, SIAM Journal on Financial Mathematics, vol. 6, pp. 1152-1170.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Xu M. Risk Measure Pricing and Hedging in Incomplete Markets // Ann. Finance. 2006. Vol. 2, №1. P. 51-71.</mixed-citation><mixed-citation xml:lang="en">Xu M. 2004, “Minimizing shortfall risk using duality approach — an application to partial hedging in incomplete markets“, PhD thesis, Carnegie Mellon University, pp. 93.</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Xu M. 2006, “Risk Measure Pricing and Hedging in Incomplete Markets“, Ann. Finance, vol. 2, no. 1, pp. 51-71.</mixed-citation><mixed-citation xml:lang="en">Xu M. 2006, “Risk Measure Pricing and Hedging in Incomplete Markets“, Ann. Finance, vol. 2, no. 1, pp. 51-71.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
