https://mongoliajol.info/index.php/MMJ/issue/feedMongolian Mathematical Journal2023-10-09T01:48:11+00:00 L.Altangerelaltangerel@gmit.edu.mnOpen Journal Systems<p>Mongolian Mathematical Journal (MMJ) was originally founded in 1997 by the Mongolian Mathematical Society with the financial support of the National University of Mongolia (1997-2003 named “Journal of Mongolian Mathematical Society”).</p> <p>MMJ is a peer-reviewed journal for the publication of original and survey papers in pure and applied mathematics</p>https://mongoliajol.info/index.php/MMJ/article/view/3000Rainbow Options with MS–VAR process2023-10-09T01:38:35+00:00Battulga Gankhuubattulga_gan@yahoo.com<p>This paper presents pricing and hedging methods for rainbow options and lookback options under Markov-Switching Vector Autoregressive (MS–VAR) process. Here we assumed that a regime–switching process is generated by a homogeneous Markov<br>process. An advantage of our model is it depends on economic variables and simple as compared with previous existing papers.</p>2023-08-31T00:00:00+00:00Copyright (c) 2022 Battulga Gankhuuhttps://mongoliajol.info/index.php/MMJ/article/view/3001Optimal Control Sphere Packing Problem2023-10-09T01:42:08+00:00Rentsen Enkhbatrenkhbat46@yahoo.com<p>The sphere packing problem which is to pack non-overlapping spheres with the maximum volume into a convex set. The problem belongs to a class of global optimization. Convex maximization formulation of the problem is given in [1, 12]. In this paper, we formulate a new optimal control problem based on the sphere packing problem which is a nonconvex optimal control problem with phase and control constraints. A discrete version of the new optimal control problem for sphere packing problem has been<br>discussed. We examine also Malfatti’s problem [17] from a view point of optimal control theory.</p>2023-08-31T00:00:00+00:00Copyright (c) 2022 Rentsen Enkhbathttps://mongoliajol.info/index.php/MMJ/article/view/3002Applications of Fenchel Duality for Vector Optimization Problems2023-10-09T01:45:13+00:00Lkhamsuren Altangerelaltangerel@gmit.edu.mn<p>This paper deals with applications of Fenchel duality for vector optimization problems based on alternative definitions of the conjugate maps and the subgradient for a set-valued map having vector variables (cf. [3]). Some results investigated in Section 4 in [3] allow us to consider applications presented in this paper.</p>2023-08-31T00:00:00+00:00Copyright (c) 2023 Lkhamsuren Altangerelhttps://mongoliajol.info/index.php/MMJ/article/view/3003Boundedness of Some Hilbert–Type Operators on the Weighted Morrey–Herz Spaces2023-10-09T01:48:11+00:00Tserendorj Batboldtsbatbold@hotmail.comAmarsaikhan Amarbayaramarbayar.amarsaikhan@empathy.edu.mnMario Krni´cmario.krnic@fer.hr<p>In this paper we establish necessary and sufficient conditions for the boundedness of a general Hilbert-type operator on the weighted Morrey-Herz spaces, without imposing conditions on a homogeneous kernel. As an application, some particular cases are also considered. Our results are compared with some previously known from the literature.</p>2023-08-31T00:00:00+00:00Copyright (c) 2023 Tserendorj Batbold, Amarsaikhan Amarbayar, Mario Krni´c