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 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1045—1352Download front and back covers
 An extension of annihilating-ideal graph of commutative rings Mahtab Koohi Kerahroodi, Fatemeh Nabaei MSC numbers : 05C99, 05C75, 05C25 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1045—1056
 On the sets of lengths of Puiseux monoids generated by multiple geometric sequences Harold Polo MSC numbers : Primary 20M13; Secondary 06F05, 20M14 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1057—1073
 Exactness of cochain complexes via additive functors Federico Campanini, Alberto Facchini MSC numbers : Primary 16E30 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1075—1085
 On Engel quasi-normal subgroup in division rings with uncountable center Khoi Minh Nguyen-Duy MSC numbers : Primary 16R40, 16S32, 20F45 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1087—1093
 On $\phi$-pseudo-Krull rings Abdelhaq El Khalfi, Hwankoo Kim, Najib Mahdou MSC numbers : Primary 13F05; Secondary 13A15, 13G05, 13B21 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1095—1106
 Common fixed point for generalized multivalued mappings via simulation function in metric spaces Swati Antal, U. C. Gairola MSC numbers : Primary 47H10, 54H25 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1107—1121
 On a new class of functions related with Mittag-Leffler and Wright functions and their properties Deepak Bansal, Khaled Mehrez MSC numbers : 33E12, 26D07 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1123—1132
 Normality concerning two families of meromorphic functions Banarsi Lal, Virender Singh MSC numbers : 30D35, 30D45 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1133—1142
 Blow-up time and blow-up rate for pseudo-parabolic equations with weighted source Huafei Di, Yadong Shang MSC numbers : Primary 35K61, 35K70, 35A23, 35B44 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1143—1158
 On multiplier weighted-space of sequences Lahcen Bouchikhi, Abdellah El Kinani MSC numbers : 46J10, 46H30 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1159—1170
 Extended generalized Mittag-Leffler function applied on fractional integral inequalities Maja Andri\'{c}, Ghulam Farid, Josip Pe\v{c}ari\'{c}, Muhammad Usama Siddique MSC numbers : Primary 26A33, 26D10, 33E12 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1171—1184
 On multi subspace-hypercyclic operators Mansooreh Moosapoor MSC numbers : Primary 47A16, 47B37, 37B99 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1185—1192
 Asymptotic evaluation of $\int_0^\infty\left(\frac{\sin x}{x}\right)^n\;dx$ Jan-Christoph Schlage-Puchta MSC numbers : 26D15, 33F05 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1193—1202
 Generic lightlike submanifolds of an indefinite trans-Sasakian manifold with a non-symmetric non-metric connection of type $(\ell, m)$ Chul Woo Lee, Jae Won Lee MSC numbers : Primary 53C25, 53C40, 53C50 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1203—1219
 {$L_k$}-biharmonic hypersurfaces in space forms with three distinct principal curvatures Mehran Aminian MSC numbers : Primary 53C40, 53C42 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1221—1244
 Classification of $(k,\mu)$-almost co-K\"{a}hler manifolds with vanishing Bach tensor and divergence free Cotton tensor Uday Chand De, Arpan Sardar MSC numbers : Primary 53C15, 53C25 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1245—1254
 A new class of Riemannian metrics on tangent bundle of a Riemannian manifold Amir Baghban, Saeed Hashemi Sababe MSC numbers : Primary 53C25, 53C15 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1255—1267
 Pseudo-Hermitian magnetic curves in normal almost contact metric 3-manifolds Ji-Eun Lee MSC numbers : Primary 53B25, 53C25 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1269—1281
 On a class of generalized recurrent $(k,\mu)$-contact metric manifolds Mohan Khatri, Jay Prakash Singh MSC numbers : 53C25, 53C15, 53D15 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1283—1297
 Remarks on the Liechti-Strenner's examples having small dilatations Ji-Young Ham, Joongul Lee MSC numbers : 37E30, 37B40, 57M60 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1299—1307
 Topological stability in hyperspace dynamical systems Namjip Koo, Hyunhee Lee, Nyamdavaa Tsegmid MSC numbers : Primary 54B20, 37C50, 37C75, 37C70 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1309—1318
 Conjugacy invariants of quaternion matrices Joonhyung Kim, Qianghua Luo MSC numbers : Primary 15B33, 51M10 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1319—1327
 Vector measures applied to optimal control for a class of evolution equations on Banach spaces Nasir Uddin Ahmed MSC numbers : Primary 34G20, 34H05, 49J27, 49J55, 93C20 Commun. Korean Math. Soc. 2020 Vol. 35, No. 4, 1329—1352

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