Contents of  Vol. 13, No. 2                                 DOI: 10.5644/SJM.13.2.00

 Mirjana Vukoviċ and Mirna Džamonja Obituary Academician Fikret Vajzoviċ 1928-2017 133 - 140 Saharon Shelah Preserving old $([\omega^{\aleph_0},\supseteq^*])$ is proper 141 - 154 Daniel Abraham Romano Strongly extensional homomorphism of implicative semigroups with apartness 155 - 162 Feng-Zhen Zhao The log-behavior of the sequence for the partial sum of a log-convex sequence 163 - 178 Zvonko Čerin Areas of polygons with coordinates of vertices from Horadam and Lucas numbers 179 - 188 Yaşar Polatoǧlu, Melike Aydoǧan and Oya Mer Relationship between the Goldberg spectrum and the B-Fredholm spectra 189 - 196 Elmir Čatrnja and Milenko Pikula An inverse problem for Sturm-Liouville type differential equation with a constant delay 197 - 205 Tuǧba Yurdakadim, Emre Taş and Özlem Girgin Atlihan Summation process of convolution operators for multivariables 207 - 216 Sadulla Z. Jafarov Approximation by means of Fourier trigonometric approximation in weighted Lebesgue spaces 217 - 226 Dennis Nemzer Quasi-Asymptotic Behavior at the Origin of Tempered Operators 227 - 237