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 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 1—274Download front and back covers
 Dehn surgeries on middle/hyper doubly Seifert twisted torus knots Sungmo Kang MSC numbers : Primary 57M25 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 1—30
 Some results on $n$-Jordan homomorphisms Jahangir Cheshmavar, Seyed Kamel Hosseini, Choonkil Park MSC numbers : Primary 47B48, 46L05, 46H25, 39B52 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 31—35
 On LCD codes over finite chain rings Y{\i}lmaz Dur\u{g}un MSC numbers : Primary 94B05, 11T71 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 37—50
 Almost sure and complete consistency of the estimator in nonparametric regression model for negatively orthant dependent random variables Liwang Ding MSC numbers : 60E05, 60F15, 62G05 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 51—68
 On operators $T$ commuting with $CTC$ where $C$ is a conjugation Muneo Ch\=o, Eungil Ko, Ji Eun Lee MSC numbers : Primary 47A05; Secondary 47B20 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 69—79
 Backward extensions of Bergman-type weighted shift Chunji Li, Wentao Qi, Haiwen Wang MSC numbers : 47B37, 47B20 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 81—93
 Distributional chaos and distributional chaos in a sequence occurring on a subset of the one-sided symbolic system Yanjie Tang, Jiandong Yin MSC numbers : 37D45, 54H20 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 95—108
 On the finiteness of real structures of projective manifolds Jin Hong Kim MSC numbers : 14J26, 14J50 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 109—115
 More on the 2-prime ideals of commutative rings Reza Nikandish, Mohammad Javad Nikmehr, Ali Yassine MSC numbers : Primary 13A15, 13C05 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 117—126
 Two remarks on the game of Cops and Robbers Yaroslav Shitov MSC numbers : 05C57, 49N75 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 127—131
 Hyperbolically close to $Q_p^\#$-sequences Rauno Aulaskari, Shamil Makhmutov, Jouni R\"atty\"a MSC numbers : 30D45, 30D50 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 133—138
 Explicit equations for mirror families to log Calabi-Yau surfaces Lawrence Jack Barrott MSC numbers : 14J33, 14N10, 14T05 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 139—165
 Colocalization of local homology modules Shahram Rezaei MSC numbers : 13D45, 13E99 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 167—177
 The weighted second main theorem and algebraic dependence of meromorphic mappings sharing moving hyperplanes Hongzhe Cao, Lizhen Duan MSC numbers : Primary 32H30, 32A22 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 179—194
 An example of large groups Ahmet Sinan Cevik MSC numbers : Primary 20L05, 20M05, 20M15, 20M50 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 195—206
 Modular invariants under the actions of some reflection groups related to Weyl groups Kenshi Ishiguro, Takahiro Koba, Toshiyuki Miyauchi, Erika Takigawa MSC numbers : Primary 55R35; Secondary 13A50, 55P60 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 207—218
 Error estimates for a Galerkin method for a coupled nonlinear Schr\"{o}dinger equations Khaled Omrani, Mohamed Rahmeni MSC numbers : 65M06, 65M12, 65M15 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 219—244
 Total domination number of central trees Xue-Gang Chen, Moo Young Sohn, Yu-Feng Wang MSC numbers : 05C69, 05C35 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 245—250
 Number theoretical properties of Romik's dynamical system Byungchul Cha, Dong Han Kim MSC numbers : Primary 11J70; Secondary 11A55 Bull. Korean Math. Soc. 2020 Vol. 57, No. 1, 251—274