Education
2004 - 2009
2004 - 2009Doctorate
Istanbul University, Institute of Graduate Studies In Sciences, Matematik, Turkey
1999 - 2002
1999 - 2002Postgraduate
Istanbul University, Institute of Graduate Studies In Sciences, Matematik, Turkey
1993 - 1998
1993 - 1998Undergraduate
Istanbul University, Faculty Of Science, Matematik, Turkey
Dissertations
2009
2009Doctorate
Polihedral Dahil Etmelerde Optimallik İçin Gerek ve Yeter Koşullar
Istanbul University, Faculty of Science, Matematik
2002
2002Postgraduate
Diskret ve Diferansiyel Dahil Etmelerde Optimallik İçin Gerek ve Yeter Koşullar
Istanbul University, Faculty of Science, Matematik
Foreign Languages
B2 Upper Intermediate
B2 Upper IntermediateEnglish
Certificates, Courses and Trainings
2017
2017İş Hukuku, İSG Kavramı, Sağlık ve Güvenlik İşaretleri, Yangın, Patlama, Parlama, Meslek Hastalıkları
Occupational Health and Safety
İstanbul Üniversitesi
2014
2014Eğitimde Etkileşim ve Katılımın Güçlendirilmesi
Education Management and Planning
İstanbul Üniversitesi
2014
2014Hedef Kitle Odaklı İçerik Editörlüğü
Other
İstanbul Üniversitesi
2012
2012Bilimsel Dergilerin Gelişimi ve Web of Science Çalıştayı
Vocational Training
Mikro Bilgi Kayıt ve Dağıtım A.Ş.
Research Areas
Mathematics
General Mathematics
Real Functions
Convex and Discrete Geometry
Operators
Optimization
Numerical Analysis
Natural Sciences
Academic Positions
2018 - Continues
2018 - ContinuesAssistant Professor
Istanbul University, Faculty of Science, Department of Mathematics
2010 - 2018
2010 - 2018Assistant Professor
Istanbul University, Faculty of Science, Department of Mathematics
1998 - 2010
1998 - 2010Research Assistant
Istanbul University, Faculty of Science, Department of Mathematics
Managerial Experience
2025 - Continues
2025 - ContinuesBeyazıt Kampüs Koordinatörlüğü
Istanbul University, Rektörlük
2025 - Continues
2025 - ContinuesHizmet Alımlarında Kontrol Teşkilatı Komisyon Üyeliği
Istanbul University, Faculty Of Science
2024 - Continues
2024 - Continuesİş Sağlığı ve Güvenliği Komisyon Üyeliği
Istanbul University, Faculty Of Science
2020 - Continues
2020 - ContinuesInternship Committee Member
Istanbul University, Faculty Of Science, Department of Mathematics
2018 - Continues
2018 - Continuesİstanbul Üniversitesi Spor Birliği Kulübü Yönetim Kurulu Üyesi
Istanbul University, Rektörlük
2016 - Continues
2016 - ContinuesFen Fakültesi Matematik Kulübü Danışmanlığı
Istanbul University, Faculty Of Science
2014 - Continues
2014 - ContinuesFen Fakültesi Spor Danışmanı
Istanbul University, Faculty Of Science
2014 - Continues
2014 - ContinuesMember of Commissions Affiliated to the Rectorate
Istanbul University, Rektörlük
2022 - 2023
2022 - 2023Fen Fak. Dekanlık Binası İlk Yardım Ekip Lideri
Istanbul University, Faculty Of Science
2017 - 2018
2017 - 2018Öğrenci Temsilcisi Seçimi Komisyonu Üyesi
Istanbul University, Faculty Of Science, Department of Mathematics
2017 - 2018
2017 - 2018Sivil Savunma Planı ve Acil Durum Eylem Planı kapsamında Edebiyat-Fen-Su Bilimleri Fakülteleri İtfaiye Servis Amir Yrd.
Istanbul University, Faculty Of Science
2012 - 2018
2012 - 2018Fen Fakültesi Matematik, Fizik ve Astronomi Dergisi Editör Yardımcılığı
Istanbul University, Faculty Of Science
2016 - 2017
2016 - 2017FEDEK Komisyon Üyesi
Istanbul University, Faculty Of Science, Department of Mathematics
2011 - 2017
2011 - 2017Matematik Lisans Müfredat Programı Komisyon Üyeliği
Istanbul University, Faculty Of Science, Department of Mathematics
2011 - 2017
2011 - 2017Matematik ABD Müfredat Programı Komisyon Üyeliği
Istanbul University, Institute of Graduate Studies In Sciences, Fen Fakültesi Bölümü
2010 - 2017
2010 - 2017Fen Fakültesi Elektronik Yayın Düzenleme Grubu Üyeliği
Istanbul University, Faculty Of Science
2010 - 2017
2010 - 2017Deputy Head of Department
İstanbul Üniversitesi, Faculty of Science, Matematik
2013 - 2016
2013 - 2016Program Coordinator
Istanbul University, Open and Dıstance Educatıon Faculty, Distance Education Programs
2010 - 2015
2010 - 2015Fen Fakültesi tescilli eser binası röleve, restitüsyon, restorasyon projesi Denetleme Komisyonu Üyeliği
Istanbul University, Rektörlük
2011 - 2014
2011 - 2014Faculty Board Member
Istanbul University, Faculty Of Science
2012 - 2013
2012 - 2013Mezuniyet Komisyonu Üyeliği
Istanbul University, Faculty Of Science, Department of Mathematics
2011 - 2013
2011 - 2013Dikey Geçiş Sınavı Ek Kontenjan İntibak Komisyonu Üyeliği
Istanbul University, Faculty Of Science, Department of Mathematics
2007 - 2013
2007 - 2013Fen Fakültesi İnternet Sitesi Yöneticisi
Istanbul University, Faculty Of Science
2012 - 2012
2012 - 2012Member of Commissions Affiliated to the Rectorate
İstanbul Üniversitesi, İdari Ve Mali İşler Daire Bşk.
2011 - 2012
2011 - 2012Yatay Geçiş İntibak Komisyonu Üyeliği
Istanbul University, Faculty Of Science, Department of Mathematics
2011 - 2011
2011 - 2011Member of Commissions Affiliated to the Rectorate
İstanbul Üniversitesi, Sağlık Kültür Ve Spor Daire Başkanlığı
2010 - 2011
2010 - 2011Head of Department
Istanbul University, Faculty Of Science, Department of Mathematics
2003 - 2009
2003 - 2009Matematik Bölümü Araştırma Görevlisi Temsilcisi
Istanbul University, Faculty Of Science, Department of Mathematics
2001 - 2009
2001 - 2009Matematik Bölümü İnternet Sitesi Yöneticisi
Istanbul University, Faculty Of Science, Department of Mathematics
Non Academic Experience
2023 - Continues
2023 - ContinuesGenel Sekreter
Professional Association, Türk Matematik Derneği, Genel Sekreterlik, Genel Sekreter
2023 - Continues
2023 - ContinuesYönetim Kurulu Üyesi
Professional Association, Mathematical Society of South Eastern Europe, Yönetim Kurulu, Yönetim Kurulu Üyesi
2022 - Continues
2022 - ContinuesUlusal Matematik Sempozyumu Koordinatörlüğü
Professional Association, Türk Matematik Derneği, Yönetim Kurulu Üyeliği, Ulusal Matematik Sempozyumu Koordinatörlüğü
2013 - Continues
2013 - ContinuesWeb sitesi kurucu ve yöneticiliği
turkmath.org, Web sitesi kurucu ve yöneticiliği
2000 - 2002
2000 - 2002Genel Sekreter Yardımcılığı
Professional Association, Türk Matematik Derneği, Genel Sekreter Yardımcılığı, Genel Sekreter Yardımcılığı
Courses
Postgraduate
Sonlu Boyutlu Öklid Uzaylarında Konveks Analiz ve Optimizasyon
LaTeX ile Matematiksel Döküman Yazma
Undergraduate
Matematik Tarihi II
Konveks Analize Giriş
Matematik Tarihi
Matematik Tarihi I
Nümerik Analiz
Temel Finans Matematiği (MAT)
Konveks Analize Giriş (İÖ)
Temel Finans Matematiği (AST)
Temel Finans Matematiği (AST-İÖ)
Temel Finans Matematiği (MAT-İÖ)
Nümerik Analiz (İÖ)
Matematik (MBG)
Matematik
Bilim Felsefesi
Bilim Felsefesi (İÖ)
Analiz III (Fizik)
Analiz II (AST-İÖ)
Analiz II (AST)
Analiz III (Fizik-İÖ)
Öğretmenlik Uygulaması
Analiz I (AST)
Analiz I (AST-İÖ)
Analiz II (MAT-İÖ)
Analiz II (MAT)
Analiz I (MAT-İÖ)
Analiz I (MAT)
Matematik I (Mühendislik Fak.)
Matematik II (Mühendislik Fak.)
Diferansiyel Denklemler I (AST-İÖ)
Öğretim Teknolojileri ve Materyal Tasarımı
Supervised Theses
2024
2024Postgraduate
Aşırı Dönüşsel ve Diyagonal Aşırı Dönüşsel Toeplitz Operatörleri
Değer Ö., Eskişehirli B. B. (Co-Advisor)
B.Kızılırmak(Student)
2018
2018Doctorate
Some Paranormed Double Sequence Spaces and Backward Difference Matrix
DEĞER Ö.
H.Çapan(Student)
2011
2011Postgraduate
Sonlu Boyutlu Uzaylarda Matematik Programlama ve Dualite
DEĞER Ö.
S.Demir(Student)
Journal articles indexed in SCI, SSCI, and AHCI
2025
2025Disjoint hypercyclic Toeplitz operators
DEĞER Ö., ESKİŞEHİRLİ B. B.
ARCHIV DER MATHEMATIK
, 2025 (SCI-Expanded)
2021
2021On Optimality for Mayer Type Problem Governed by a Discrete Inclusion System with Lipschitzian Set-Valued Mappings
DEĞER Ö.
FILOMAT
, vol.35, no.7, pp.2333-2340, 2021 (SCI-Expanded)
2016
2016Optimization of third-order discrete and differential inclusions described by polyhedral set-valued mappings
Mahmudov E., Demir S., Deger Ö.
APPLICABLE ANALYSIS
, vol.95, no.9, pp.1831-1844, 2016 (SCI-Expanded)
2011
2011OPTIMAL CONTROL OF ELLIPTIC DIFFERENTIAL INCLUSIONS WITH DIRICHLET AND NEUMANN BOUNDARY CONDITIONS
Mahmudov E., Deger O.
JOURNAL OF DYNAMICAL AND CONTROL SYSTEMS
, vol.17, no.2, pp.163-185, 2011 (SCI-Expanded)
Articles Published in Other Journals
2022
2022Public Lectures by Cahit Arf at Atatürk University (Erzurum)
Değer Ö.
OSMANLI BILIMI ARA?TIRMALARI
, vol.23, pp.439-443, 2022 (Peer-Reviewed Journal)
2020
2020Polihedral Küme-Değerli Dönüşümlerin Yardımıyla Bir Eşitsizlik Sisteminin Çözülebilirliği Üzerine
DEĞER Ö.
International Journal of Advances in Engineering and Pure Sciences , vol.32, no.4, pp.494-498, 2020 (Peer-Reviewed Journal)
2011
2011On Optimality Conditions for a Convex Optimization Problem with Polyhedral Discrete Inclusions
Değer Ö.
University of Istanbul Faculty of Science the Journal of Mathematics, Physics and Astronomy, New Series , vol.3, pp.109-118, 2011 (Peer-Reviewed Journal)
2006
2006Necessary and Sufficient Conditions for Optimality in Discrete Inclusions Described by Convex Multivalued Mappings and Duality
Mahmudov E., Değer Ö.
University of Istanbul Faculty of Science the Journal of Mathematics, Physics and Astronomy, New Series , vol.1, pp.105-114, 2006 (Peer-Reviewed Journal)
2005
2005On an Optimization Problem Described by Multivalued Mappings and Duality
Mahmudov E., Değer Ö.
APPLIED AND COMPUTATIONAL MATHEMATICS , vol.4, pp.192-199, 2005 (Scopus)
Papers Presented at Peer-Reviewed Scientific Conferences
2022
2022Optimization of semilinear third-order delay-differential inclusions using the adjoint Mahmudov inclusion
Değer Ö., Mahmudov E., Mastaliyeva D. I.
6th International Conference of Mathematical Sciences, ICMS 2022, Hybrid, Istanbul, Turkey, 20 - 24 July 2022, vol.2879, no.1, (Full Text)
2023
2023Diyagonal Aşırı Dönüşsel Teoplitz Operatörleri
Eskişehirli B. B., Değer Ö.
35. Ulusal Matematik Sempozyumu, Edirne, Turkey, 4 - 08 September 2023, pp.30, (Summary Text)
2023
2023Hypercyclic Toeplitz Operators on the Hilbert-Hardy Space in the Unit Disc
Kızılırmak B., Değer Ö., Eskişehirli B. B.
7th International Conference of Mathematical Sciences, İstanbul, Turkey, 5 - 09 July 2023, pp.28, (Summary Text)
2023
2023A new disjoint hypercyclicity criterion
Eskişehirli B. B., Değer Ö.
7th International Conference of Mathematical Science ICMS 2023, İstanbul, Turkey, 5 - 09 July 2023, pp.26, (Summary Text)
2020
2020A necessary condition for a mayer type set-valued optimization problem governed by a discrete inclusion system
Değer Ö.
4th International Conference of Mathematical Sciences, İstanbul, Turkey, 17 June 2020, vol.2334, no.1, pp.300061-300064, (Full Text)
2020
2020A Necessary Condition for a Terminal Point Problem Governed by a Discrete Inclusion System
Değer Ö.
4th International Conference of Mathematical Sciences (ICMS 2020), İstanbul, Turkey, 17 - 21 June 2020, pp.38, (Summary Text)
2020
2020On Optimal Solutions to a Generalized Heron Problem
Çebi E., Değer Ö.
4th International Conference of Mathematical Sciences, 17 - 21 June 2020, pp.30, (Summary Text)
2019
2019A Minimization Algorithm for Limit Extremal Problems on Convex Compactum
Deger O.
3rd International Conference of Mathematical Sciences (ICMS), İstanbul, Turkey, 4 - 08 September 2019, vol.2183, (Full Text)
2018
2018On Some Applications for Convex Set-Valued Mappings
Değer Ö.
2nd International Conference of Mathematical Sciences, İstanbul, Turkey, 31 July - 06 August 2018, pp.72, (Summary Text)
2009
2009Optimal Control of The Elliptic Type Differential Inclusions with Dirichlet and Neumann Boundary Conditions
Mahmudov E., Değer Ö.
International Conference of Mathematical Sciences, İstanbul, Turkey, 1 - 04 August 2009, pp.151, (Summary Text)
2005
2005Optimization Problem Described by Multivalued Mappings and Duality
Mahmudov E., Değer Ö.
The 1st International Conference on Control and Optimization with Industrial Applications, Baku, Azerbaijan, 1 - 04 May 2005, pp.65, (Summary Text)
Other Publications
2018
2018Matematik Dünyası Dergisi: Türkiye'deki Matematiksel Etkinlikler
Değer Ö.
Other, pp.7, 2018
2017
2017Matematik Dünyası Dergisi: Türkiye'deki Matematiksel Etkinlikler
Değer Ö.
Other, pp.7, 2017
2016
2016Matematik Dünyası Dergisi: Türkiye'deki Matematiksel Etkinlikler
Değer Ö.
Other, pp.8, 2016
2016
2016Matematik Dünyası Dergisi: Türkiye'deki Matematiksel Etkinlikler
Değer Ö.
Other, pp.7, 2016
2015
2015Matematik Dünyası Dergisi: Türkiye'deki Matematiksel Etkinlikler
Değer Ö.
Other, pp.6, 2015
Funded Projects
2024 - 2025
2024 - 2025Bazı Optimal Kontrol Problemlerinde Çözümün Varlığı ve Optimallik Koşulları
TUBITAK Project
Demir Sağlam S. (Executive), Değer Ö.
2018 - 2019
2018 - 2019Optimization of Third Order Discrete and Differential Inclusions Described by Polyhedral Set-Valued Mappings
Project Supported by Higher Education Institutions
DEMİR SAĞLAM S. (Executive), MAHMUDOV E., DEĞER Ö.
2015 - 2017
2015 - 2017Approximation and Optimization of Third Order Polyhedral Discrete And Differential Inclusions
Project Supported by Higher Education Institutions
DEĞER Ö. (Executive), DEMİR SAĞLAM S.
2012 - 2013
2012 - 2013Optimal Control of Elliptic Differential Inclusions
Project Supported by Higher Education Institutions
DEĞER Ö. (Executive)
2011 - 2012
2011 - 2012Sonlu Boyutlu Uzaylarda Matematik Programlama ve Dualite
Project Supported by Higher Education Institutions
DEĞER Ö. (Executive)
Activities in Scientific Journals
2019 - Continues
2019 - ContinuesOSMANLI BILIMI ARA?TIRMALARI
Publication Committee Member
2012 - 2018
2012 - 2018İstanbul University. Science Faculty. The Journal of Mathematics, Physics and Astronomy
Assistant Editor/Section Editor
Memberships and Roles in Scientific Organizations
2024 - Continues
2024 - ContinuesAmerican Mathematical Society
Member
2023 - Continues
2023 - ContinuesTurkish Mathematical Society
Secretary General
2023 - Continues
2023 - ContinuesMathematical Society of South Eastern Europe
Board Member
1999 - Continues
1999 - ContinuesTürk Matematik Derneği
Member
2022 - 2023
2022 - 2023Turkish Mathematical Society
Board Member
Peer Reviews in Scientific Publications
January 2024
January 2024OSMANLI BILIMI ARA?TIRMALARI
Other Indexed Journal
October 2022
October 2022OSMANLI BILIMI ARA?TIRMALARI
Other Indexed Journal
March 2021
March 2021OSMANLI BILIMI ARA?TIRMALARI
Other Indexed Journal
July 2020
July 2020OSMANLI BILIMI ARA?TIRMALARI
Other Indexed Journal
September 2019
September 2019International journal of advances in engineering and pure sciences (Online)
National Scientific Refreed Journal
April 2019
April 2019OSMANLI BILIMI ARA?TIRMALARI
Other Indexed Journal
March 2019
March 2019SÜLEYMAN DEMIREL ÜNIVERSITESI FEN EDEBIYAT FAKÜLTESI FEN DERGISI = SÜLEYMAN DEMIREL UNIVERSITY FACULTY OF ARTS AND SCIENCE JOURNAL OF SCIENCE
National Scientific Refreed Journal
December 2018
December 2018OSMANLI BILIMI ARA?TIRMALARI
Other Indexed Journal
October 2013
October 2013İstanbul University Science Faculty Journal of Mathematics, Physics and Astronomy
Other Indexed Journal
Scientific Consultations
2016 - 2018
2016 - 2018Scientific Consultancy
İstanbul İl Milli Eğitim Müdürlüğü
Istanbul University, Faculty Of Science, Department of Mathematics, Turkey
Roles in Event Organizations
October 2022
October 202211. Bahar Matematik Buluşması
Student Club and Community Activity
Değer Ö., Altınkol İ.
Turkey
May 2022
May 2022Öğrenci Matematik Çalıştayı VIII
Student Club and Community Activity
Değer Ö., Sezgin S.
İstanbul, Turkey
April 2021
April 2021Öğrenci Matematik Çalıştayı VII
Student Club and Community Activity
Değer Ö., Ertan M.
İstanbul, Turkey
June 2020
June 20204th International Conference of Mathematical Sciences
Scientific Congress
Çakallı H., D.R. Kocinac L., Harte R., Değer Ö.
İstanbul, Turkey
September 2019
September 20193rd International Conference of Mathematical Sciences
Scientific Congress
Çakallı H., Gürtuğ Ö., Duru H., Değer Ö., Yıldız Ş., S. Djordjevic D.
İstanbul, Turkey
July 2019
July 2019Journées Arithmétiques XXXI
Scientific Congress
Uludağ A. M., Kurşungöz K., Değer Ö., Boylan H., Bassa A., Zeytin A., et al.
İstanbul, Turkey
April 2019
April 2019Öğrenci Matematik Çalıştayı V
Student Club and Community Activity
Değer Ö., İşcan S.
İstanbul, Turkey
August 2018
August 20182nd International Conference of Mathematical Sciences
Scientific Congress
Çakallı H., D.R. Kocinac L., Dik M., Gürtuğ Ö., Değer Ö., Yıldız Ş.
İstanbul, Turkey
April 2018
April 2018Öğrenci Matematik Çalıştayı IV
Student Club and Community Activity
Değer Ö., Koyun A.
İstanbul, Turkey
April 2017
April 2017Öğrenci Matematik Çalıştayı III
Student Club and Community Activity
Değer Ö., Koyun A.
İstanbul, Turkey
August 2009
August 2009International Conference of Mathematical Sciences
Scientific Congress
Çakallı H., Çanak İ., Değer Ö.
İstanbul, Turkey
Congress and Symposium Activities
04 September 2023 - 08 September 2023
04 September 2023 - 08 September 202335. Ulusal Matematik Sempozyumu
Attendee
Edirne-Turkey
04 September 2023 - 08 September 2023
04 September 2023 - 08 September 202335. Ulusal Matematik Sempozyumu
Session Moderator
Edirne-Turkey
05 July 2023 - 09 July 2023
05 July 2023 - 09 July 20237th International Conference of Mathematical Sciences
Attendee
İstanbul-Turkey
05 July 2023 - 09 July 2023
05 July 2023 - 09 July 20237th International Conference of Mathematical Sciences
Attendee
İstanbul-Turkey
20 July 2022 - 24 July 2022
20 July 2022 - 24 July 20226th International Conference of Mathematical Sciences
Attendee
İstanbul-Turkey
17 June 2020 - 21 June 2020
17 June 2020 - 21 June 20204th International Conference of Mathematical Sciences
Attendee
İstanbul-Turkey
19 November 2019 - 19 November 2019
19 November 2019 - 19 November 2019Beşiktaş İlçe Milli Eğitim Müdürlüğü I. Zümreler Çalıştayı
Session Moderator
İstanbul-Turkey
04 September 2019 - 08 September 2019
04 September 2019 - 08 September 20193nd International Conference of Mathematical Sciences
Attendee
İstanbul-Turkey
31 July 2018 - 06 August 2018
31 July 2018 - 06 August 20182nd International Conference of Mathematical Sciences
Attendee
İstanbul-Turkey
29 April 2016 - 29 April 2016
29 April 2016 - 29 April 2016Öğrenci Matematik Çalıştayı II
Panelists
İstanbul-Turkey
04 August 2009 - 10 August 2009
04 August 2009 - 10 August 2009International Conference of Mathematical Sciences
Attendee
İstanbul-Turkey
22 May 2005 - 25 May 2005
22 May 2005 - 25 May 2005The 1st International Conference on Control and Optimization with Industrial Applications
Attendee
Baku-Azerbaijan
Citations
Total Citations (WOS): 22
h-index (WOS): 3
Jury Memberships
June-2024
June 2024Post Graduate
Büşra Kızılırmak Tez Savunması - İstanbul Üniversitesi
June-2022
June 2022Post Graduate
Büşra Akgün Tez Savunması - İstanbul Üniversitesi
June-2022
June 2022Post Graduate
Esra Çebi Tez Savunması - İstanbul Üniversitesi
July-2019
July 2019Post Graduate
Şükran Keskin Tez Savunması - İstanbul Üniversitesi
July-2018
July 2018Doctorate
Hüsamettin Çapan Tez Savunması - İstanbul Üniversitesi
June-2018
June 2018Doctorate
Ali Uğur Sazaklıoğlu Tez Savunması - İstanbul Üniversitesi
April-2017
April 2017Doctorate
Sevilay Demir Sağlam Tez Savunma - İstanbul Üniversitesi
June-2016
June 2016Post Graduate
Gülşah Bozcu Tez Savunması - İstanbul Üniversitesi
September-2015
September 2015Post Graduate
Mutlu Avcı Tez Savunması - İstanbul Üniversitesi
June-2014
June 2014Post Graduate
Burcu Çınarcı Tez Savunması - İstanbul Üniversitesi
December-2011
December 2011Post Graduate
Sevilay Demir Tez Savunması - İstanbul Üniversitesi
June-2011
June 2011Post Graduate
Beyaz Başak Koca Tez Savunması - İstanbul Üniversitesi
June-2011
June 2011Post Graduate
Sultan Bozkurt Tez Savunması - İstanbul Üniversitesi
June-2011
June 2011