Auwal Bala Abubakar

Auwal Bala Abubakar

Auwal Bala Abubakar

Assistant Professor

Numerical Optimization and Applications, Numerical Linear Algebra, Numerical Analysis, Machine Learning.

Dr. Auwal Bala Abubakar  is an Assistant Professor of Mathematics. A Nigerian, who can speak English, Hausa and Arabic (basic). He is happily married with four Kids. 

Selected Publications

  1. Abubakar, A. B., Kumam, P., Mohammad, H., Ibrahim, A. H., Seangwattana, T., & Hassan, B. A. (2024). A hybrid BFGS-Like method for monotone operator equations with applications. Journal of Computational and Applied Mathematics, 115857.
  2. Abubakar, A. B., Kumam, P., Liu, J., Mohammad, H., & Tammer, C. (2023). New three-term conjugate gradient algorithm for solving monotone nonlinear equations and signal recovery problems. International Journal of Computer Mathematics, 100(10), 1992-2013.(ISI, IF=1.8, Citation=0)
  3. Abubakar, A. B., Kumam, P., Mohammad, H., Ibrahim, A. H., & Kiri, A. I. (2022). A hybrid approach for finding approximate solutions to constrained nonlinear monotone operator equations with applications. Applied Numerical Mathematics. \url{https://doi.org/10.1016/j.apnum.2022.03.001} (ISI, IF=2.8, Citation=5)
  4. Abubakar, A. B., Kumam, P., Malik, M., \& Ibrahim, A. H. (2022). A hybrid conjugate gradient based approach for solving unconstrained optimization and motion control problems. Mathematics and Computers in Simulation, 201, 640-657.   (ISI, IF=4.6, Citation=17)
  5. Abubakar, A.B., Sabi'u, J., Kumam, P. et al. Solving nonlinear monotone operator equations via modified SR1 update. J. Appl. Math. Comput. (2021).

Expanded Publication List

Corresponding/First Author
1. Abdullahi, M., Al-Yaari, A., Abubakar, A. B., & Sani, A. (2025). An effective double direction
method for solving convex-constrained nonlinear equations with image restoration. AIMS
Mathematics, 10(12), 28926-28953.
2. Abubakar, A. B., Ibrahim, A. H., & Feng, Y. (2025). Derivative-free projection CG-based
algorithm with restart strategy for solving convex-constrained nonlinear monotone equations
and its application to logistic regression. Journal of Computational and Applied Mathematics,
116676.
3. Muangchoo, K., & Abubakar, A. B. (2024). Enhanced Projection Method for the Solution
of the System of Nonlinear Equations Under a More General Assumption than Pseudo-
Monotonicity and Lipschitz Continuity. Mathematics, 12(23), 3734.
4. Abubakar, A. B., Kumam, P., Mohammad, H., Ibrahim, A. H., Seangwattana, T., & Hassan, B.
A. (2024). A hybrid BFGS-Like method for monotone operator equations with applications.
Journal of Computational and Applied Mathematics, 115857.
5. Abubakar, A. B., Ibrahim, A. H., Abdullahi, M., Aphane, M., & Chen, J. (2023). A suffi-
cient descent LS-PRP-BFGS-like method for solving nonlinear monotone equations with
application to image restoration. Numerical Algorithms, 1-42. (ISI, IF=2.1, Citation=0)
6. Deepho, J., Malik, M., & Abubakar, A. B. (2023). Extended modified three-term conju-
gate gradient method for large-scale nonlinear equations. Indonesian Journal of Electrical
Engineering and Computer Science, 32(1), 167-176. (SCOPUS, Quartile=Q3, Citation=0)
7. Abubakar, A. B., Kumam, P., Liu, J., Mohammad, H., & Tammer, C. (2023). New three-term
conjugate gradient algorithm for solving monotone nonlinear equations and signal recovery
problems. International Journal of Computer Mathematics, 100(10), 1992-2013.(ISI, IF=1.8,
Citation=0)
2
8. Abubakar, A. B., Mohammad, H., Kumam, P., Rano, S. A., Ibrahim, A. H., & Kiri, A.
I. (2022). On the new spectral conjugate gradient-type method for monotone nonlinear
equations and signal recovery. Mathematical Methods in the Applied Sciences.https:
//doi.org/10.1002/mma.8479 (ISI, IF=2.9, Citation=1)
9. Abubakar, A. B., Kumam, P., Mohammad, H., Ibrahim, A. H., & Kiri, A. I. (2022). A hybrid
approach for finding approximate solutions to constrained nonlinear monotone operator
equations with applications. Applied Numerical Mathematics. https://doi.org/10.1016/
j.apnum.2022.03.001 (ISI, IF=2.8, Citation=5)
10. Abubakar, A. B., Malik, M., Kumam, P., Mohammad, H., Sun, M., Ibrahim, A. H., & Kiri,
A. I. (2022). A Liu-Storey-type conjugate gradient method for unconstrained minimization
problem with application in motion control. Journal of King Saud University-Science, 34(4),
101923. (ISI, IF=2.8, Citation=16)
11. A. B. Abubakar, P. Kumam and A. H. Ibrahim, "Inertial Derivative-Free Projection Method
for Nonlinear Monotone Operator Equations with Convex Constraints," in IEEE Access, vol.
9, pp. 92157-92167, 2021, doi: 10.1109/ACCESS.2021.3091906. (ISI, IF=3.9, Citation=12)
12. Abubakar, A. B., Kumam, P., Ibrahim, A. H., Chaipunya, P., & Rano, S. A. (2021). New
hybrid three-term spectral-conjugate gradient method for finding solutions of nonlinear
monotone operator equations with applications. Mathematics and Computers in Simulation.
doi:10.1016/j.matcom.2021.07.005 (ISI, IF=4.6, Citation=8)
13. Abubakar, A. B., Kumam, P., Malik, M., & Ibrahim, A. H. (2022). A hybrid conjugate gradi-
ent based approach for solving unconstrained optimization and motion control problems.
Mathematics and Computers in Simulation, 201, 640-657. (ISI, IF=4.6, Citation=17)
14. Bala Abubakar, A., Mohammad, H., & Yusuf Waziri, M. (2021). Two derivative-free algo-
rithms for constrained nonlinear monotone equations. Computational and Mathematical
Methods, 3(6), e1176. (ISI, IF=0.9, Citation=1)
15. Abubakar, A. B., Muangchoo, K., Ibrahim, A. H., Fadugba, S. E., Aremu, K. O., & Jolaoso,
L. O. (2021). A modified scaled spectral-conjugate gradient-based algorithm for solving
monotone operator equations. Journal of Mathematics, 2021, 1-9. (ISI, IF=1.4, Citation=6)
16. Abubakar, A. B., Kumam, P., Malik, M., Chaipunya, P., & Ibrahim, A. H. (2021). A hybrid
FR-DY conjugate gradient algorithm for unconstrained optimization with application in
portfolio selection. AIMS Mathematics, 6(6), 6506-6527. (ISI, IF=2.2, Citation=19)
17. Abubakar, A.B., Kumam, P., Mohammad, H. et al. PRP-like algorithm for monotone
operator equations. Japan J. Indust. Appl. Math. (2021). https://doi.org/10.1007/
s13160-021-00462-2 (ISI, IF=0.9, Citation=19)
18. Abubakar, A. B., Muangchoo, K., Ibrahim, A. H., Abubakar, J., & Rano, S. A. (2021). FR-type
algorithm for finding approximate solutions to nonlinear monotone operator equations.
Arabian Journal of Mathematics, 10, 261-270. (ISI, IF=1.2, Citation=15)
19. A. B. Abubakar, K. Muangchoo, A. H. Ibrahim, A. B. Muhammad, L. O. Jolaoso and K.
O. Aremu, "A New Three-Term Hestenes-Stiefel Type Method for Nonlinear Monotone
Operator Equations and Image Restoration," in IEEE Access, vol. 9, pp. 18262-18277, 2021,
doi: 10.1109/ACCESS.2021.3053141. (ISI, IF=3.9, Citation=20)
20. Abubakar, A.B., Sabi’u, J., Kumam, P. et al. Solving nonlinear monotone operator equations
via modified SR1 update. J. Appl. Math. Comput. (2021). https://doi.org/10.1007/
s12190-020-01461-1. (ISI, IF=2.2, Citation=11)
3
21. Abubakar, A. B., Kumam, P., Ibrahim, A. H., & Rilwan, J. (2020). Derivative-free HS-DY-type
method for solving nonlinear equations and image restoration. Heliyon, 6(11). (ISI, IF=4,
Citation=21)
22. Abubakar, A. B., Kumam, P., Mohammad, H., & Awwal, A. M. (2020). A Barzilai-Borwein
gradient projection method for sparse signal and blurred image restoration. Journal of the
Franklin Institute, 357(11), 7266-7285. (ISI, IF=4.1, Citation=24)
23. Abubakar, A. B., Kumam, P., & Mohammad, H. (2020). A note on the spectral gradient
projection method for nonlinear monotone equations with applications. Computational and
Applied Mathematics, 39(2), 129. (ISI, IF=2.6, Citation=33)
24. Abubakar, A. B., Rilwan, J., Yimer, S. E., Ibrahim, A. H., & Ahmed, I. (2020). Spectral
three-term conjugate descent method for solving nonlinear monotone equations with convex
constraints. Thai Journal of Mathematics, 18(1), 501-517. (ISI, IF=0.5, Citation=26)
25. Abubakar, A. B., Kumam, P., & Awwal, A. M. (2019). Global convergence via descent
modified three-term conjugate gradient projection algorithm with applications to signal
recovery. Results in Applied Mathematics, 4, 100069. (ISI, IF=2, Citation=12)
26. Abubakar, A. B., Kumam, P., & Awwal, A. M. (2019). An inexact conjugate gradient method
for symmetric nonlinear equations. Computational and Mathematical Methods, 1(6), e1065.
(ISI, IF=0.9, Citation=5)
27. Abubakar, A. B., Kumam, P., Mohammad, H., & Awwal, A. M. (2019). An efficient conjugate
gradient method for convex constrained monotone nonlinear equations with applications.
Mathematics, 7(9), 767. (ISI, IF=2.4, Citation=19)
28. Abubakar, A. B., Kumam, P., Mohammad, H., Awwal, A. M., & Sitthithakerngkiet, K. (2019).
A modified Fletcher-Reeves conjugate gradient method for monotone nonlinear equations
with some applications. Mathematics, 7(8), 745. (ISI, IF=2.4, Citation=29)
29. Abubakar, A. B., Kumam, P., Awwal, A. M., & Thounthong, P. (2019). A modified self-
adaptive conjugate gradient method for solving convex constrained monotone nonlinear
equations for signal recovery problems. Mathematics, 7(8), 693. (ISI, IF=2.4, Citation=16)
30. Abubakar, A. B., Kumam, P., & Awwal, A. M. (2018). A descent dai-liao projection method
for convex constrained nonlinear monotone equations with applications. Thai Journal of
Mathematics. (ISI, IF=0.5, Citation=13)
31. Abubakar, A.B and Kumam, P. An improved three-term derivative-free method for solving
nonlinear equations. Computational and Applied Mathematics 37(1), 2018. (ISI, IF=2.6,
Citation=40)
32. Abubakar, A. B., & Kumam, P. (2019). A descent Dai-Liao conjugate gradient method for
nonlinear equations. Numerical Algorithms, 81, 197-210. (ISI, IF=2.1, Citation=76)
Co-Author
1. Abdullahi, M., Pan, K., Halilu, A. S., & Abubakar, A. B. (2025). An accelerated derivative-free
method using Picard-Krasnoselskii iterative process with applications in motion control.
International Journal of Computer Mathematics, 1-25.
2. Abdullahi, M., Pan, K., Halilu, A. S., Abubakar, A. B., & Zakari, F. I. (2025). Two accelerated
double-direction methods for convex-constrained nonlinear equations with applications.
Numerical Algorithms, 1-28.
3. Abdullahi, M., Halilu, A. S., Pan, K., & Bala, A. A. (2025). Two double direction methods for
convex-constrained nonlinear monotone equations with image recovery of Spherical Parts.
Communications in Nonlinear Science and Numerical Simulation, 109315.
4. Ibrahim, A. H., Phiangsungnoen, S., Adamu, A., & Abubakar, A. B. (2025). Projection-Based
Method for Finding Zeros of Nonlinear Equations. Mathematical Methods in the Applied
Sciences.
5. Abdullahi, M., Pan, K., Bala Abubakar, A., & Sani Halilu, A. (2025). An Inertial Spec-
tral Conjugate Gradient Method for Monotone Nonlinear Equations With Applications.
Mathematical Methods in the Applied Sciences, 48(11), 10623-10638.
6. Deepho, J., Ibrahim, A. H., Abubakar, A. B., & Aphane, M. (2024). Hybridized Brazilian-
Bowein type spectral gradient projection method for constrained nonlinear equations. Results
in Control and Optimization, 17, 100483.
7. Yusuf, A., Manjak, N. H., Mohammad, H., Kiri, A. I., & Abubakar, A. B. (2024, June). A
solution method for nonlinear monotone equations via hybrid spectral conjugate gradient
and signal recovery problems. In Operations Research Forum (Vol. 5, No. 2, pp. 1-16).
Springer International Publishing.
8. Abdullahi, M., Abubakar, A. B., Sulaiman, A., & Chotpitayasunon, P. (2024). An efficient
projection algorithm for solving convex constrained monotone operator equations and sparse
signal reconstruction problems. The Journal of Analysis, 1-20.
9. R.Z. Al-Kawaz, A.B. Abubakar, A.H. Ibrahim, K. Khammahawong, Algorithm for solving
nonlinear monotone operator equations with applications, J. Nonlinear Funct. Anal. 2023
(2023) 37. (ISI, IF=1.6, Citation=0)
10. Kumam, P., Abubakar, A. B., Malik, M., Ibrahim, A. H., Pakkaranang, N., & Panyanak, B.
(2023). A hybrid HS-LS conjugate gradient algorithm for unconstrained optimization with
applications in motion control and image recovery. Journal of Computational and Applied
Mathematics, 433, 115304. (ISI, IF=2.4, Citation=0)
11. Abdullahi, M., Abubakar, A. B., & Salihu, S. B. (2023). Global convergence via modified self-
adaptive approach for solving constrained monotone nonlinear equations with application
to signal recovery problems. RAIRO-Operations Research, 57(5), 2561-2584. (ISI, IF=1.8,
Citation=1)
12. Abdullahi, M., Abubakar, A. B., & Muangchoo, K. (2023). Modified three-term derivative-free
projection method for solving nonlinear monotone equations with application. Numerical
Algorithms, 1-16. (ISI, IF=2.1, Citation=1)
13. Abdullahi, M., Abubakar, A. B., Feng, Y., & Liu, J. (2023). Comment on: A derivative-free
iterative method for nonlinear monotone equations with convex constraints. Numerical
Algorithms, 1-10. (ISI, IF=2.1, Citation=2)
14. Deepho, J., Adamu, A., Ibrahim, A. H., & Abubakar, A. B. (2023). Relaxed viscosity-type
iterative methods with application to compressed sensing. The Journal of Analysis, 1-17.
(ISI, IF=0.7, Citation=1)
15. Jirakitpuwapat, W., Kumam, P., Deesuwan, T., Padcharoen, A., Kitkuan, D., & Abubakar,
A. B. (2023). Image quality assessment: from difference to relative entropy. Thai Journal of
Mathematics, 21(1), 39-51. (ISI, IF=0.5, Citation=0)
16. Ibrahim, A. H., Deepho, J., Abubakar, A. B., & Kamandi, A. (2022). A globally convergent
derivative-free projection algorithm for signal processing. Journal of Interdisciplinary
Mathematics, 25(8), 2301-2320. (ISI, IF=1.7, Citation=5)
17. Ibrahim, A. H., Kumam, P., Abubakar, A. B., & Abubakar, J. (2023). A derivative-free
projection method for nonlinear equations with non-Lipschitz operator: Application to
LASSO problem. Mathematical Methods in the Applied Sciences. https://doi.org/10.
1002/mma.9033 (ISI, IF=2.9, Citation=2)
18. Ibrahim, A. H., Kumam, P., Abubakar, A. B., Abdullahi, M. S., & Mohammad, H. (2022). A
Dai-Liao-type projection method for monotone nonlinear equations and signal processing.
Demonstratio Mathematica, 55(1), 978-1013. (ISI, IF=2, Citation=6)
19. Muangchoo, K., Adamu, A., Ibrahim, A.H., Abubakar, A.B.. An inertial Halpern-type
algorithm involving monotone operators on real Banach spaces with application to image
recovery problems. Comp. Appl. Math. 41, 364 (2022). https://doi.org/10.1007/s40314-022-
02064-1 (ISI, IF=2.6, Citation=2)
20. Malik, M., Sulaiman, I. M., Abubakar, A. B., & Ardaneswari, G. (2023). A new family of
hybrid three-term conjugate gradient method for unconstrained optimization with applica-
tion to image restoration and portfolio selection. AIMS Mathematics, 8(1), 1-28. (ISI, IF=2.2,
Citation=4)
21. Ibrahim, A.H., Kumam, P., Abubakar, A.B., Abubakar, J., Rilwan, J. and Taddele, G.H.,
2022. Derivative-Free MLSCD Conjugate Gradient Method for Sparse Signal and Image
Reconstruction in Compressive Sensing. Filomat, 36(6), pp.2011-2024. (ISI, IF=0.8, Citation=1)
22. Ibrahim, A. H., Kumam, P., Rapajic, S., Papp, Z., & Abubakar, A. B. (2022). Approximation
methods with inertial term for large-scale nonlinear monotone equations. Applied Numerical
Mathematics, 181, 417-435. (ISI, IF=2.8, Citation=6)
23. Abdullahi, S. B., Khunpanuk, C., Bature, Z. A., Chiroma, H., Pakkaranang, N., Abubakar,
A. B., & Ibrahim, A. H. (2022). Biometric Information Recognition Using Artificial Intelli-
gence Algorithms: A Performance Comparison. IEEE Access, 10, 49167-49183. (ISI, IF=3.9,
Citation=5)
24. Ibrahim, A. H., Muangchoo, K., Mohamed, N. S., & Abubakar, A. B. (2022). Derivative-free
SMR conjugate gradient method for con-straint nonlinear equations. Journal of Mathematics
and Computer Science, 24(2), 147-164. (SCOPUS, Quartile=Q2, Citation=19)
25. Ibrahim, A. H., Kumam, P., Sun, M., Chaipunya, P., & Abubakar, A. B. (2022). Projection
method with inertial step for nonlinear equations: application to signal recovery. Journal of
Industrial and Management Optimization, 19(1), 30-55. (SCOPUS, Quartile=Q3, Citation=11)
26. Kambheera, A., Ibrahim, A. H., Muhammad, A. B., Abubakar, A. B., & Hassan, B. A. (2022).
Modified Dai-Yuan conjugate gradient method with sufficient descent property for nonlinear
equations. Thai Journal of Mathematics, 145-167. (ISI, IF=0.5, Citation=2)
27. Kumam, P., Abubakar, A. B., Ibrahim, A. H., Kura, H. U., Panyanak, B., & Pakkaranang, N.
(2022). Another hybrid approach for solving monotone operator equations and application
to signal processing. Mathematical Methods in the Applied Sciences. https://doi.org/10.
1002/mma.8285 (ISI, IF=2.9, Citation=3)
28. Ibrahim, A. H., Kumam, P., Abubakar, A. B., & Abubakar, J. (2022). A descent three-term
derivative-free method for signal reconstruction in compressive sensing. Carpathian Journal
of Mathematics, 38(2), 431-443. (ISI, IF=1.4, Citation=1)
29. Hamza, M. M., Abubakar, A. B., Panyanak, B., & Pakkaranang, N. (2022). Free convection
flow in a microchannel filled with porous material having temperature-dependent thermal
conductivity. Mathematical Methods in the Applied Sciences. (ISI, IF=2.9, Citation=1)
30. Ibrahim, A. H., Kumam, P., Kamandi, A., & Abubakar, A. B. (2022). An efficient hybrid
conjugate gradient method for unconstrained optimization. Optimization Methods and
Software, 37(4), 1370-1383. (ISI, IF=2.2, Citation=8)
31. Ibrahim, A.H., Kumam, P., Abubakar, A.B., & Abubakar, J.. A method with inertial
extrapolation step for convex constrained monotone equations. J Inequal Appl 2021, 189
(2021). https://doi.org/10.1186/s13660-021-02719-3 (ISI, IF=1.6, Citation=6)
32. Deepho, J., Abubakar, A. B., Malik, M., & Argyros, I. K. (2022). Solving unconstrained
optimization problems via hybrid CD-DY conjugate gradient methods with applications.
Journal of Computational and Applied Mathematics, 405, 113823. (ISI, IF=2.4, Citation=12)
33. Hassan Ibrahim, A., Kumam, P., Bala Abubakar, A., & Adamu, A. (2022). Accelerated
derivative-free method for nonlinear monotone equations with an application. Numerical
Linear Algebra with Applications, 29(3), e2424. (ISI, IF=4.3, Citation=15)
34. Mohammad, H., Awwal, A. M., Abubakar, A. B., & Musa, A. S. B. (2021). On the derivative-
free quasi-Newton-type algorithm for separable systems of nonlinear equations. RAIRO-
Operations Research, 55(6), 3293-3316. (ISI, IF=1.8, Citation=1)
35. Ibrahim, A. H., Kumam, P., Hassan, B. A., Abubakar, A. B., & Abubakar, J. (2021). A
Derivative-Free Three-Term Hestenes-Stiefel Type Method for Constrained Nonlinear Equa-
tions and Image Restoration. International Journal of Computer Mathematics, 1-22. (ISI,
IF=1.8, Citation=25)
36. Sabi’u, J., Muangchoo, K., Shah, A., Abubakar, A. B., & Aremu, K. O. (2021). An inexact
optimal hybrid conjugate gradient method for solving symmetric nonlinear equations.
Symmetry, 13(10), 1829. (ISI, IF=2.7, Citation=6)
37. Malik, M., Abubakar, A. B., Sulaiman, I. M., Mamat, M., & Abas, S. S. (2021). A New
Three-Term Conjugate Gradient Method for Unconstrained Optimization with Applications
in Portfolio Selection and Robotic Motion Control. IAENG International Journal of Applied
Mathematics, 51(3). (SCOPUS, Quartile=Q4, Citation=8)
38. Ibrahim, A. H., Deepho, J., Abubakar, A. B., & Adamu, A. (2021). A three-term Polak–
Ribière–Polyak derivative-free method and its application to image restoration. Scientific
African, 13, e00880. (ISI, IF=2.9, Citation=14)
39. Ibrahim, A. H., Deepho, J., Abubakar, A. B., & Aremu, K. O. (2021). A modified liu-storey-
conjugate descent hybrid projection method for convex constrained nonlinear equations and
image restoration. Numer. Alg. Cont. Optim. doi, 10. (ISI, IF=1.3, Citation=9)
40. Adamu, A., Deepho, J., Ibrahim, A. H., & Abubakar, A. B. (2021). Approximation of zeros of
sum of monotone mappings with applications to variational inequality and image restoration
problems. Nonlinear Funct. Anal. Appl, 26(2), 411-432. (SCOPUS, Quartile=Q3, Citation=15)
41. Abdullahi, S. B., Muangchoo, K., Abubakar, A. B., Ibrahim, A. H., & Aremu, K. O. (2021).
Data-driven AI-based parameters tuning using grid partition algorithm for predicting
climatic effect on epidemic diseases. IEEE Access, 9, 55388-55412. (ISI, IF=3.9, Citation=6)
42. Mohammad, H., Waziri, M. Y., & Abubakar, A. B. (2021). A Derivative-Free Multivariate
Spectral Projection Algorithm for Constrained NonLinear Monotone Equations. International
Journal of Applied and Computational Mathematics, 7(2), 55. (SCOPUS, Quartile=Q3,
Citation=2)
7
43. Danmalam, K. U., Mohammad, H., Abubakar, A. B., & Auwal, A. M. (2021). Hybrid
algorithm for system of nonlinear monotone equations based on the convex combination
of Fletcher-Reeves and a new conjugate residual parameters. Thai Journal of Mathematics,
18(4), 2093-2106. (ISI, IF=0.5, Citation=2)
44. Sabi’u, J., Muangchoo, K., Shah, A., Abubakar, A. B., & Jolaoso, L. O. (2021). A modified
PRP-CG type derivative-free algorithm with optimal choices for solving large-scale nonlinear
symmetric equations. Symmetry, 13(2), 234. (ISI, IF=2.7, Citation=6)
45. Noinakorn, S., Ibrahim, A. H., Abubakar, A. B., & Pakkaranang, N. (2021). A THREE-TERM
INERTIAL DERIVATIVE-FREE PROJECTION METHOD FOR CONVEX CONSTRAINED
MONOTONE EQUATIONS. Nonlinear Functional Analysis and Applications, 26(4), 839-853.
(SCOPUS, Quartile=Q3, Citation=3)
46. Waziri, M. Y., Yusuf, A., & Abubakar, A. B. (2020). Improved conjugate gradient method
for nonlinear system of equations. Computational and Applied Mathematics, 39, 1-17. (ISI,
IF=2.6, Citation=2)
47. Ibrahim, A. H., Kumam, P., Abubakar, A. B.., Yusuf, U. B., Yimer, S. E., & Aremu, K. O.
(2020). An efficient gradient-free projection algorithm for constrained nonlinear equations
and image restoration. Aims Math, 6(1), 235. (ISI, IF=2.2, Citation=27)
48. Ibrahim, A. H., Kumam, P., Abubakar, A. B., Yusuf, U. B., & Rilwan, J. (2020). Derivative-free
conjugate residual algorithms for convex constraints nonlinear monotone equations and
signal recovery. Journal of Nonlinear and Convex Analysis, 21(9), 1959-1972. (ISI, IF=1.1,
Citation=23)
49. Ibrahim, A. H., Muangchoo, K., Abubakar, A. B., Adedokun, A. D., & Mohammed, H.
(2020). Spectral conjugate gradient like method for signal reconstruction. Thai Journal of
Mathematics, 18(4), 2013-2022. (ISI, IF=0.5, Citation=18)
50. Aji, S., Kumam, P., Siricharoen, P., Abubakar, A. B., & Yahaya, M. M. (2020). A modified con-
jugate descent projection method for monotone nonlinear equations and image restoration.
IEEE Access, 8, 158656-158665. (ISI, IF=3.9, Citation=9)
51. Awwal, A. M., Kumam, P., Mohammad, H., Watthayu, W., & Abubakar, A. B. (2021). A Perry-
type derivative-free algorithm for solving nonlinear system of equations and minimizing ℓ1
regularized problem. Optimization, 70(5-6), 1231-1259. (ISI, IF=2.2, Citation=22)
52. Hassan Ibrahim, A., Kumam, P., Abubakar, A. B., Abubakar, J., & Muhammad, A. B. (2020).
Least-square-based three-term conjugate gradient projection method for ℓ1-norm problems
with application to compressed sensing. Mathematics, 8(4), 602. (ISI, IF=2.4, Citation=26)
53. Rehman, H. U., Kumam, P., Abubakar, A. B., & Cho, Y. J. (2020). The extragradient
algorithm with inertial effects extended to equilibrium problems. Computational and
Applied Mathematics, 39, 1-26. (ISI, IF=2.6, Citation=45)
54. Mohammad, H., & Abubakar, A. B. (2020). A descent derivative-free algorithm for nonlinear
monotone equations with convex constraints. RAIRO-Operations Research, 54(2), 489-505.
(ISI, IF=1.8, Citation=31)
55. Ibrahim, A. H., Kumam, P., Abubakar, A. B., Jirakitpuwapat, W., & Abubakar, J. (2020). A
hybrid conjugate gradient algorithm for constrained monotone equations with application
in compressive sensing. Heliyon, 6(3). (ISI, IF=4, Citation=43)
56. Awwal, A. M., Kumam, P., & Abubakar, A. B. (2019). A modified conjugate gradient method
for monotone nonlinear equations with convex constraints. Applied Numerical Mathematics,
145, 507- 520. (ISI, IF=2.8, Citation=41)
8
57. Awwal, A. M., Kumam, P., & Abubakar, A. B. (2019). Spectral modified Polak-Ribière-Poylak
projection conjugate gradient method for solving monotone systems of nonlinear equations.
Applied Mathematics and Computation, 362, 124514. (ISI, IF=4, Citation=21)
58. Ibrahim, A. H., Garba, A. I., Usman, H., Abubakar, J., & Abubakar, A. B. (2019). Derivative-
free rmil conjugate gradient algorithm for convex constrained equations. Thai Journal of
Mathematics, 18(1). (ISI, IF=0.5, Citation=25)
59. Awwal, A. M., Kumam, P., Abubakar, A. B., & Wakili, A. (2018). A projection Hestenes-
Stiefel like method for monotone nonlinear equations with convex constraints. Thai Journal
of Mathematics, 16, 181-199. (ISI, IF=0.5, Citation=4)
60. Awwal, A. M., Kumam, P., Abubakar, A. B., Wakili, A., & Pakkaranang, N. (2018). A New
Hybrid Spectral Gradient Projection Method for Monotone System Equations with Convex
Constraints. Thai Journal of Mathematics, 125, 147. (ISI, IF=0.5, Citation=19)
61. Mohammad, H., & Abubakar, A. B. (2017). A positive spectral gradient-like method for
large-scale nonlinear monotone equations. Bull. Comput. Appl. Math., Vol.5, No.1, 2017.
(SCOPUS, Quartile=Q4, Citation=27)

Grants and Fellowships

  1. Petchra Pra Jom Klao Three year Doctoral degree scholarship, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand, August 2017 - July 2020.
  2.  Petchra Pra Jom Klao Grant to attend 9th International workshop on the Fixed point and Rough set theories, and Applied topology (IWFRAT-2018), Chonbuk National University, Jeonju, Republic of Korea.
  3. Petchra Pra Jom Klao Grant to attend the International Conference of Honam- Youngnam Mathematical Societies, Jeju, Republic of Korea, 2018.
  4. .Petchra Pra Jom Klao Grant to attend the International Symposium on Nonlinear Convex Analysis and Optimization (NCAO 2018), KMUTT, Bangkok, Thailand.
  5.  Petchra Pra Jom Klao Grant to attend the 10th Asian conference on fixed point theory and optimization (ACFPTO2018); advances in fixed point and optimization theories towards real world problems, Chiang-Mai, Thailand.
  6. Petchra Pra Jom Klao Grant to attend the 13th International Symposium of South East Asian Technical University Consortium (SEATUC), Hanoi University of Science and Technology, Hanoi, Vietnam, 2019.
  7.  Petchra Pra Jom Klao Grant to attend the International Conference on Computational and Mathematical Methods in Science and Engineering (CMMSE), Rota, Cadiz-Spain, 2019.
  8. Petchra Pra Jom Klao Grant for a Short-term research visit under supervision of Prof. Dr. Christiane Tammer, 10th May 2019 - 30th October 2019, Martin Luther University, Wittenberg, Halle (Saale), Germany.
  9. Petchra Pra Jom Klao Grant to attend the International Conference on Numerical Analysis and Optimization (NAOV-2020), January 6-9, 2020, Muscat, Sultanate of Oman.
  10. Petchra Pra Jom Klao Grant to attend the International Conference on Recent Advances in Applied Mathematics 2020 (ICRAAM2020), February 4-6, 2020, Kuala Lumpur, Malaysia.

Courses Taught

1. Elementary Mathematics I (Undergraduate)
2. Elementary Mathematics III (Undergraduate)
3. Elements of Set Theory (Undergraduate)
4. Numerical Analysis (Undergraduate & Postgraduate)
5. Linear Algebra (Undergraduate)
6. Probability (Undergraduate)
7. Elementary Differential Equations (Undergraduate)
8. Fundamentals of Optimization (Postgraduate)
9. MATH 113 (Calculus I)
10. MATH 114 (Calculus II)
11. MATH 203 (Linear Algebra)

Education

2017-2020 Doctarate in Applied Mathematics (PhD. Applied Mathematics)
King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
Advisor: Prof. Poom Kumam
Co-advisor: Prof. Christiane Tammer
2012-2015 Masters in Mathematics (MSc. Mathematics)
Bayero University Kano, Nigeria
Advisor: Dr. Mohammed Yusuf Waziri
2006-2011 Bachelor’s degree in Mathematics (BSc. Mathematics)
Bayero University Kano, Nigeria

Recent Presentations

  1. Abdullahi, M., Al-Yaari, A., Abubakar, A. B., & Sani, A. (2025). An effective double direction
    method for solving convex-constrained nonlinear equations with image restoration. AIMS
    Mathematics, 10(12), 28926-28953.
  2.  Abubakar, A. B., Ibrahim, A. H., & Feng, Y. (2025). Derivative-free projection CG-based
    algorithm with restart strategy for solving convex-constrained nonlinear monotone equations
    and its application to logistic regression. Journal of Computational and Applied Mathematics,
    116676.
  3. Abdullahi, M., Pan, K., Halilu, A. S., & Abubakar, A. B. (2025). An accelerated derivative-free
    method using Picard-Krasnoselskii iterative process with applications in motion control.
    International Journal of Computer Mathematics, 1-25.
  4. Abdullahi, M., Pan, K., Halilu, A. S., Abubakar, A. B., & Zakari, F. I. (2025). Two accelerated
    double-direction methods for convex-constrained nonlinear equations with applications.
    Numerical Algorithms, 1-28.
  5. Abdullahi, M., Halilu, A. S., Pan, K., & Bala, A. A. (2025). Two double direction methods for
    convex-constrained nonlinear monotone equations with image recovery of Spherical Parts.
    Communications in Nonlinear Science and Numerical Simulation, 109315.
  6. Ibrahim, A. H., Phiangsungnoen, S., Adamu, A., & Abubakar, A. B. (2025). Projection-Based
    Method for Finding Zeros of Nonlinear Equations. Mathematical Methods in the Applied
    Sciences.
  7. Abdullahi, M., Pan, K., Bala Abubakar, A., & Sani Halilu, A. (2025). An Inertial Spec-
    tral Conjugate Gradient Method for Monotone Nonlinear Equations With Applications.
    Mathematical Methods in the Applied Sciences, 48(11), 10623-10638.