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Bull. Korean Math. Soc. 2020 Vol. 57, No. 4, 815—1081
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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