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 Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, : 1053—1314
 Complete spacelike hypersurfaces with CMC in Lorentz Einstein manifolds Jiancheng Liu, Xun Xie Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1053—1068
 Some results on 1-absorbing primary and weakly 1-absorbing primary ideals of commutative rings Reza Nikandish, Mohammad Javad Nikmehr, Ali Yassine Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1069—1078
 New congruences with the generalized Catalan numbers and harmonic numbers Laid Elkhiri, Sibel Koparal, Ne\c{s}e \"{O}m\"{u}r Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1079—1095
 A note on stabilization heights of fiber surfaces and the Hopf invariants Keiji Tagami Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1097—1107
 Long-time behavior of a family of incompressible three-dimensional Leray-$\alpha$-like models Cung The Anh, Le Thi Thuy, Le Tran Tinh Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1109—1127
 A note on the finite-dimensional odd Contact superalgebra over a field of prime characteristic Weidong Hong, Xiaoning Xu Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1129—1147
 New bounds for fundamental units and class numbers of real quadratic fields Sevcan I\c{s}ikay, Ayten Pek{$\dot{\textsc i}$}n Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1149—1161
 MacWilliams identity for linear codes over finite chain rings with respect to homogeneous weight Mina Moeini, Rashid Rezaei, Karim Samei Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1163—1173
 Meromorphic function partially shares small functions or values with its linear $c$-shift operator Abhijit Banerjee, Sayantan Maity Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1175—1192
 Characterization of Lie type derivation on von Neumann algebra with local actions Mohammad Ashraf, Aisha Jabeen Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1193—1208
 $(\sigma, \sigma)$-derivation and $(\sigma, \tau)$-weak amenability of Beurling algebra Lin Chen, Jianhua Zhang Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1209—1219
 Commutative rings and modules that are $r$-Noetherian Adam Anebri, Najib Mahdou, \"{U}nsal Tekir Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1221—1233
 A remark on $L^2$ extension theorems Dano Kim Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1235—1245
 On barycentric transformations of Fano polytopes DongSeon Hwang, Yeonsu Kim Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1247—1260
 Duality of weighted sum formulas of alternating multiple $T$-values Ce Xu Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1261—1278
 On Erd\H os chains in the plane Jonathan Passant Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1279—1300
 On the geometry of the crossed product of groups F\i rat Ate\c{s}, Ahmet Sinan \c{C}evik, Eylem G\"{u}zel Karpuz Bull. Korean Math. Soc. 2021 Vol. 58, No. 5, 1301—1314