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 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 815—1081Download front and back covers
 On diversity of certain $t$-intersecting families Cheng Yeaw Ku, Kok Bin Wong MSC numbers : 05C05, 05D99 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 815—829
 Linear maps preserving $\mathcal{AN}$-operators Ramesh Golla, Hiroyuki Osaka MSC numbers : Primary 15A86, 47B49, 47B07, 47B48; Secondary 47A10 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 831—838
 Sharp bounds for initial coefficients and the second Hankel determinant Rosihan M. Ali, See Keong Lee, Milutin Obradovi\'{c} MSC numbers : Primary 30C45, 30C50 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 839—850
 A note on multilinear pseudo-differential operators and iterated commutators Yongming Wen, Huoxiong Wu, Qingying Xue MSC numbers : Primary 47G30, 42B20; Secondary 42B25, 46E30 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 851—864
 Dependent subsets of embedded projective varieties Edoardo Ballico MSC numbers : 14N05 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 865—872
 The K\"{u}nneth isomorphism in bounded cohomology preserving the norms HeeSook Park MSC numbers : Primary 55T99; Secondary 18G40 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 873—890
 On well-posedness and blow-up criterion for the 2D tropical climate model Mulan Zhou MSC numbers : Primary 35D35, 76D03 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 891—907
 Nielsen spectrum of maps on infra-solvmanifolds modeled on $\Sol_0^{\kern2pt 4}$ Jong Bum Lee MSC numbers : Primary 57S30, 57S20, 22E25 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 909—919
 Local existence for an isentropic compressible Navier-Stokes-$P1$ approximate model arising in radiation hydrodynamics Jishan Fan, Yuxi Hu, Gen Nakamura MSC numbers : Primary 35Q30, 35Q35, 35B25 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 921—932
 Galkin's lower bound conjecure for Lagrangian and orthogonal Grassmannians Daewoong Cheong, Manwook Han MSC numbers : 14N35, 05E15, 14J33, 47N50 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 933—943
 On $S$-exchange rings Dajun Liu, Jiaqun Wei MSC numbers : Primary 18G35 16G10; Secondary 18E30 16E05 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 945—956
 On Jordan and Jordan higher derivable maps of rings Lei Liu MSC numbers : Primary 16W25; Secondary 47B47 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 957—972
 Harmanci injectivity of modules Burcu Ungor MSC numbers : Primary 16D10, 16D40, 16D50, 16E30 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 973—990
 Existence of transcendental meromorphic solutions on some types of nonlinear differential equations Peichu Hu, Manli Liu MSC numbers : Primary 39A10, 30D35, 39A12 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 991—1002
 Qualitative properties of weak solutions for $p$-Laplacian equations with nonlocal source and gradient absorption Zakariya Chaouai, Abderrahmane El Hachimi MSC numbers : Primary 35K55, 35B09, 35B51 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 1003—1031
 On conditionally defined Fibonacci and Lucas sequences and periodicity Skylyn Irby, Sandra Spiroff MSC numbers : Primary 11B39, 15A06 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 1033—1048
 Ancient solutions of codimension two surfaces with curvature pinching in $\mathbb{R}^4$ Zhengchao Ji MSC numbers : Primary 53C44, 35K55 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 1049—1060
 Expressions of meromorphic solutions of a certain type of nonlinear complex differential equations Jun-Fan Chen, Gui Lian MSC numbers : 30D35, 34A34, 34M05 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 1061—1073
 Flat dimensions of injective modules over domains Kui Hu, Jung Wook Lim, De Chuan Zhou MSC numbers : 13G05, 13D03 Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 1075—1081

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