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Biography

I received my doctoral degree in 2013 from the University of Sulaimani, K.R. I have held positions as a lecturer at KUST University, Garmian University, Raparin University, and Sulaimani Polytechnic University. Currently, I am an assistant professor at the College of Science, University of Sulaimani. Throughout my career, I have taught various courses in Mathematics and Statistics at both undergraduate and graduate levels.

My specialty is complex analysis, with specific focus areas including analytic functions, univalent functions, starlike functions, convex functions, meromorphic functions, harmonic univalent functions, uniformly starlike functions, uniformly convex functions, and their fuzzy aspects. Additionally, I have published scholarly articles in these fields and served as Principal Investigator and researcher in numerous online learning projects.

Activities

Employment (1)

University of Sulaimani: Sulaimani, Kurdistan Region, IQ

2004 to present (Mathematics)
Employment
Source: Self-asserted source
Pishtiwan Othman Sabir

Works (31)

APPROXIMATE SOLUTION TO THE SYSTEM OF NONLINEAR VOLTERRA INTEGRO-FRACTIONAL DIFFERENTIAL EQUATIONS WITH VARIABLE COEFFICIENTS USING LINEAR B-SPLINE FUNCTIONS

Journal of Southwest Jiaotong University
2024 | Journal article
Contributors: Mariwan Rashid Ahmed; Shazad Shawki Ahmed; Pishtiwan Othman Sabir
Source: check_circle
Crossref

Some m-fold symmetric bi-univalent function classes and their associated Taylor-Maclaurin coefficient bounds

Journal of Inequalities and Applications
2024 | Journal article
Contributors: Srivastava, Hari Mohan; Sabir, Pishtiwan Othman; Eker, Sevtap Sümer; Wanas, Abbas Kareem; Mohammed, Pshtiwan Othman; Chorfi, Nejmeddine; Baleanu, Dumitru
Source: Self-asserted source
Pishtiwan Othman Sabir

Comment on the paper by Jalal et al. [Chaos, Solitons and Fractals 135 (2020) 109712]

Chaos, Solitons & Fractals
2024-10 | Journal article
Part of ISSN: 0960-0779
Contributors: Bawar Mohammed Faraj; Pishtiwan Othman Sabir; Dana Taha Mohammed Salih; Hozan Hilmi
Source: Self-asserted source
Pishtiwan Othman Sabir

Uniqueness Results Based on Delta Fractional Operators for Certain Boundary Value Problems

Fractals
2024-10-15 | Journal article
Part of ISSN: 0218-348X
Part of ISSN: 1793-6543
Contributors: Pshtiwan Othman Mohammed; Ravi P. Agarwal; Dumitru Baleanu; Pishtiwan Othman Sabir; Majeed A. Yousif; Mohamed Abdelwahed
Source: Self-asserted source
Pishtiwan Othman Sabir

Some Classes of Bazilevič-Type Close-to-Convex Functions Involving a New Derivative Operator

Symmetry
2024-07-03 | Journal article
Contributors: Pishtiwan Othman Sabir; Alina Alb Lupas; Sipal Saeed Khalil; Pshtiwan Othman Mohammed; Mohamed Abdelwahed
Source: check_circle
Crossref

Sharp Bounds on Toeplitz Determinants for Starlike and Convex Functions Associated with Bilinear Transformations

Symmetry
2024-05-11 | Journal article
Contributors: Pishtiwan Othman Sabir
Source: check_circle
Crossref

Hankel determinant for a general subclass of m-fold symmetric biunivalent functions defined by Ruscheweyh operators

Journal of Inequalities and Applications
2024-01-30 | Journal article
Part of ISSN: 1029-242X
Contributors: Pishtiwan Othman Sabir; Ravi P. Agarwal; Shabaz Jalil Mohammedfaeq; Pshtiwan Othman Mohammed; Nejmeddine Chorfi; Thabet Abdeljawad
Source: Self-asserted source
Pishtiwan Othman Sabir

Some remarks for subclasses of bi-univalent functions defined by Ruscheweyh derivative operator

Filomat
2024-01-02 | Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

A comprehensive subclass of bi-univalent functions defined by a linear combination and satisfying subordination conditions

AIMS Mathematics
2023 | Journal article
Part of ISSN: 2473-6988
Contributors: Hari Mohan Srivastava; Pishtiwan Othman Sabir; Khalid Ibrahim Abdullah; Nafya Hameed Mohammed; Nejmeddine Chorfi; Pshtiwan Othman Mohammed
Source: Self-asserted source
Pishtiwan Othman Sabir

A Family of Holomorphic and m-Fold Symmetric Bi-Univalent Functions Endowed with Coefficient Estimate Problems

Mathematics
2023-09-19 | Journal article
Part of ISSN: 2227-7390
Contributors: Pishtiwan Othman Sabir; Hari M. Srivastava; waggas galib atshan; P. O. Mohammed; Nejmeddine Chorfi; Miguel Vivas-Cortez
Source: Self-asserted source
Pishtiwan Othman Sabir

Some New Properties of Convex and Concave Soft Sets

Diyala Journal For Pure Science
2019-01-01 | Journal article
Part of ISSN: 2222-8373
Contributors: Hero Salih; Pishtiwan Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

"Coefficient Estimate Problems for Certain Subclasses of m-Fold Symmetric Bi-Univalent Functions Associated with the Ruscheweyh Derivative," arXiv:2304.11571v1 [math.CV] 23 Apr 2023, 2023.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

"Hankel determinant for a general subclass of m-fold symmetric bi-univalent functions defined by Ruscheweyh operator," arXiv:2304.11695v1 [math.CV] 23 Apr 2023, 2023.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

Combinations of 𝑳-Complex Fuzzy t-Norms and t-Conorms, Third International Conference of Mathematics and its applications (TICMA 2022).

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

Cut Set Theorems for Rectangular 𝑳-fuzzy Complex Numbers and 𝑳-multi-fuzzy Complex Numbers, Journal of Zankoy Sulaimani, Vol. 24, No. 1, (2022) pp 67-84.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

Fuzzy Convergence of Fuzzy Complex Series, 5th ICBS 2017-College of Education-Garmian University (2107) 145-156.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

Generalized Semistrongly Convex Fuzzy Sets, Journal of Zankoy Sulaimani, Vol. 18, No. 3, (2016) pp 241-248.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

Notes on Extension of Fuzzy Complex Sets, Tikrit Journal of Pure Science, Vol. 22, No. 9, (2017) pp 88-93.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

On Continuity of Complex Fuzzy Functions, Mathematical Theory and Modeling, 3(2013) No.10, pp 41-46.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

On Fuzzy Complex Derivatives II, Canadian Journal of Pure and Applied Sciences, 8 (2014) No. 3, pp 3163-3165.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

On Fuzzy Complex Derivatives, IOSR Journal of Mathematics, 2 (2012) Issue 5, pp 47-52.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

On Fuzzy Complex Integrals, Asian Transactions on Science & Technology, 2 (2012) Issue 04, pp 12-17.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

On Fuzzy Complex Sequences, The Journal of Duhok University 16 (2013) No. 1, pp 72-80.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

On Fuzzy Numbers and Fuzzy Convergence of Fuzzy Sequence, Journal of Koya University 26 (2013) pp 33-56.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

On N-Fuzzy Complex Numbers, Journal of College of Education-Baghdad, 3 (2008) pp 164-170.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

On N-Fuzzy Numbers, Journal of College of Education-Baghdad, 9 (2009) pp 158-168.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

On Series of Fuzzy Numbers, IOSR Journal of Mathematics, 7 (2013) Issue 02, pp 88-90.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

Sequences of N-Fuzzy Numbers, Journal of Koya University, 10 (2009) pp 45-63.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

Some New Properties of Convex and Concave Soft Sets, Diyala Journal for Pure Sciences, Vol. 15, No. 1, (2019) pp 84-94.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

The Continuity and Differentiation of Complex Fuzzy Functions for New Fuzzy Quantities, Asian Transactions on Science & Technology, 2 (2012) Issue 04, pp 1-11.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir

Type 2 Fuzzy Convexity, fifth International Conference on basic Sciences (ICBS 2017)-College of Education-Garmian University (2017) 131-144.

Journal article
Contributors: Pishtiwan Othman Sabir
Source: Self-asserted source
Pishtiwan Othman Sabir