Turkish Journal of Mathematics
Volume 45, Number 2 (2021)
Cover and Contents
Articles
Notes on multivalent Bazilevic functions defined by higher order derivatives
MOHAMED K. AOUF, ADELA O. MOSTAFA, and TEODOR BULBOACA
Pages 624-633
Order compact and unbounded order compact operators
NAZİFE ERKURŞUN ÖZCAN, NİYAZİ ANIL GEZER, ŞAZİYE ECE ÖZDEMİR, and İREM MESUDE GEYİKÇİ
Pages 634-646
Exact and nonstandard finite difference schemes for the Burgers equation B(2,2)
CANAN KÖROĞLU and AYHAN AYDIN
Pages 647-660
Dynnikov coordinates on punctured torus
ALEV MERAL
Pages 661-677
Close-to-convexity of a class of harmonic mappings defined by a third-order differential inequality
ELİF YAŞAR and SİBEL YALÇIN TOKGÖZ
Pages 678-694
Portfolio optimization with two quasiconvex risk measures
ÇAĞIN ARARAT
Pages 695-717
Gauss-Bonnet theorems and the Lorentzian Heisenberg group
Tong Wu, SINING WEI, and YONG WANG
Pages 718-741
A new implicit-explicit local differential method for boundary value problems
HÜSEYİN TUNÇ and MURAT SARI
Pages 742-766
On a fifth-order nonselfadjoint boundary value problem
EKİN UĞURLU and KENAN TAŞ
Pages 767-781
On rings whose Jacobson radical coincides with upper nilradical
GUANGLIN MA, YAO WANG, and YANLI REN
Pages 782-796
Estimations on some hybrid exponential sums related to Kloosterman sums
YINGJIE CHENG, XIWANG CAO, LIQIN QIAN, and JINLONG WAN
Pages 797-819
On some generalizations of the beta function in several variables
MUSTAPHA RAISSOULI and SALMA EL-SOUBHY
Pages 820-842
T$_{4}$, Urysohn's lemma, and Tietze extension theorem for constant filter convergence spaces
TESNİM MERYEM BARAN and AYHAN ERCİYES
Pages 843-855
The Lebesgue constants on projective spaces
ALEXANDER KUSHPEL
Pages 856-863
Existence of nonnegative solutions for discrete Robin boundary value problems with sign-changing weight
YAN ZHU
Pages 864-877
On elements whose Moore-Penrose inverse is idempotent in a ${\ast}$-ring
HAIYANG ZHU, JIANLONG CHEN, and YUKUN ZHOU
Pages 878-889
Completeness conditions of systems of Bessel functions in weighted $L^2$-spaces in terms of entire functions
RUSLAN KHATS'
Pages 890-895
Volume properties and some characterizations of ellipsoids in ${\Bbb E}^{n+1}$
DONG-SOO KIM, INCHEON KIM, and YOUNG HO KIM
Pages 896-908
On ordered $\Gamma$-hypersemigroups, minimal bi-ideals, and minimal left ideals
NIOVI KEHAYOPULU
Pages 909-918
New oscillation criteria for differential equations with sublinear and superlinear neutral terms
ALI MUHIB, ELMETWALLY M. ELABBASY, and OSAMA MOAAZ
Pages 919-928
Korovkin type approximation via triangular $A-$statistical convergence on an infinite interval
SELİN ÇINAR, SEVDA YILDIZ, and KAMİL DEMİRCİ
Pages 929-942
Oscillation tests for nonlinear differential equations with nonmonotone delays
NURTEN KILIÇ
Pages 943-954
Some properties of second-order weak subdifferentials
GONCA İNCEOĞLU
Pages 955-960
Almost quasi clean rings
TUFAN ÖZDİN
Pages 961-970
Some soft topological properties and fixed soft element results in soft complex valued metric spaces
İZZETTİN DEMİR
Pages 971-987
On the spectral and scattering properties of eigenparameter dependent discrete impulsive Sturm-Liouville equations
YELDA AYGAR KÜÇÜKEVCİLİOĞLU, ELGİZ BAYRAM, and GÜHER GÜLÇEHRE ÖZBEY
Pages 988-1000
Unitals in projective planes of order 16
STOICHO DIMITROV STOICHEV and MUSTAFA GEZEK
Pages 1001-1014
Operators between different weighted Frechet and (LB)-spaces of analytic functions
ERSİN KIZGUT
Pages 1015-1029
Preservers of the local spectral radius zero of Jordan product of operators
MHAMED ELHODAIBI and SOMAYA SABER
Pages 1030-1039
Hardy-Copson type inequalities for nabla time scale calculus
ZEYNEP KAYAR and BİLLUR KAYMAKÇALAN
Pages 1040-1064
Editors
- Editor-in-Chief
- Prof. Dr. Adnan TERCAN Hacettepe University
- Associate Editor-in-Chief
- Prof. Dr. Aydın GEZER Atatürk University
