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 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 275—533Download front and back covers
 A note on cohomological dimension over Cohen-Macaulay rings Iraj Bagheriyeh, Kamal Bahmanpour, Ghader Ghasemi MSC numbers : Primary 13D45, 13E05 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 275—280
 Global solution and blow-up of logarithmic Klein-Gordon equation Yaojun Ye MSC numbers : Primary 35L05, 35L10, 35B40 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 281—294
 Linear and non-linear loop-transversal codes in error-correction and graph domination Mehmet Da\v{g}l{\i}, Bokhee Im, Jonathan D. H. Smith MSC numbers : 94B60, 20N05, 05C69 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 295—309
 Infinite horizon optimal control problems of backward stochastic delay differential equations in Hilbert spaces Hong Liang, Jianjun Zhou MSC numbers : 93E20, 60H30, 49K27, 49N10 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 311—330
 Nodal solutions for an elliptic equation in an annulus without the signum condition Tianlan Chen, Yanqiong Lu, Ruyun Ma MSC numbers : Primary 34B15, 35J25 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 331—343
 On four new mock theta functions QiuXia Hu MSC numbers : 11F03, 11B65, 11F27 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 345—354
 Bounds for radii of convexity of some $q$-Bessel functions Ibrahim Aktas, Halit Orhan MSC numbers : Primary 30C45, 30C15, 33C10 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 355—369
 Some new characterizations of quasi-Frobenius rings by using pure-injectivity Ali Moradzadeh-Dehkordi MSC numbers : Primary 16L60, 13C11; Secondary 16P40 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 371—381
 Endpoint estimates for multilinear fractional maximal operators Suixin He, Jing Zhang MSC numbers : Primary 42B20, 42B25, 42B35 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 383—391
 Asymptotic exactness of some Bank--Weiser error estimator for quadratic triangular finite element Kwang-Yeon Kim, Ju-Seong Park MSC numbers : Primary 65N30, 65N15 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 393—406
 On the first generalized Hilbert coefficient and depth of associated graded rings Amir Mafi, Dler Naderi MSC numbers : 13A30, 13D40, 13H15, 13C14 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 407—417
 Notes on finitely generated flat modules Abolfazl Tarizadeh MSC numbers : 13C10, 19A13, 13C11, 13E99 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 419—427
 Multipliers of Dirichlet-type subspaces of Bloch space Songxiao Li, Zengjian Lou, Conghui Shen MSC numbers : Primary 30H30, 47B38, 32A37 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 429—441
 Smooth points of ${\mathcal L}_s(^nl_{\infty}^2)$ Sung Guen Kim MSC numbers : Primary 46A22 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 443—447
 On the actions of Higman-Thompson groups by homeomorphisms Jin Hong Kim MSC numbers : 20F65, 20F28, 57S25 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 449—457
 On generalizations of skew quasi-cyclic codes Sumeyra Bedir, Fatmanur Gursoy, Irfan Siap MSC numbers : Primary 94B05, 94B60, 11T71 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 459—479
 Exact formula for Jacobi-Eisenstein series of square free discriminant lattice index Ran Xiong MSC numbers : 11F50, 11M36 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 481—488
 Evaluations of some quadratic Euler sums Xin Si, Ce Xu MSC numbers : Primary 11M06, 11M32, 33B15 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 489—508
 Fredholm Toeplitz operators on the Dirichlet spaces of the polydisk Kyunguk Na MSC numbers : Primary 47B35; Secondary 32A37 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 509—520
 On the Bergman kernel for some Hartogs domains Jong-Do Park MSC numbers : Primary 32A25, 32A07, 33C05 Bull. Korean Math. Soc. 2020 Vol. 57, No. 2, 521—533

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