Ousmane Seydi

Tenure-Track Research Chair (Chaire de Professeur Junior)
Université Le Havre Normandie, Normandie Univ.
LMAH UR3821, 76600 Le Havre, France

Applied Mathematics

Publications Download CV

Research Interests

Differential equations, Semigroups, Integrated semigroups, Epidemiology and Ecology modelling, Population dynamics, Singular perturbations theory, Invariant manifolds theory.

Publications

  1. Dieye, M., Djidjou-Demasse, R., Seydi, O., Time-Dependent Positively Invariant Sets on Cauchy Problems: Applications in Population Dynamics, Acta Applicandae Mathematicae 201, 15 (2026). DOI
  2. Ducrot, A., Seydi, O., An age-structured model within a spatially explicit landscape: the case study of the black cherry invasion in France, Theoretical Ecology 19(1), 4 (2026).
  3. Burie, J.-B., Ducrot, A., Seydi, O., Early-stage invasion and spreading speed in a resource-dependent dispersal model, Mathematical Biosciences 392 (2026), 109585. DOI
  4. Camara, M., Djidjou-Demasse, R., Seydi, O., Age-structured modeling of pathogen invasion and host resistance in fungal plant diseases, Discrete and Continuous Dynamical Systems - B 35 (2026), 66–100. DOI
  5. Augeraud-Véron, E., Ducrot, A., Seydi, O., Game-Theoretic Optimization in Spatial Control of Invasive Plants: Comparison of Decentralized and Centralized Strategies, Biokybernetika, to appear.
  6. Djidjou-Demasse, R., Seydi, O., Rapaport, A., Evolutionary attractors in the chemostat model, SIAM Journal on Applied Mathematics 85(6) (2025), 2459–2485.
  7. Pane, M., Richard, Q., Seydi, O. et al., Mathematical modeling of intra- and inter-species interactions in mixed malaria within-host infections, Journal of Mathematical Analysis and Applications 547(1) (2025), 129251.
  8. Diop, B., Ducrot, A., Seydi, O., Mathematical modelling and analysis of the adaptive dynamics in mosquito populations: uniform persistence of malaria infection, Journal of Mathematical Biology 90(4) (2025), 1–50.
  9. Ndongmo Teytsa, H.M., Seydi, O., Tsanou, B., Djidjou-Demasse, R., Within-Host Mathematical Modeling of Antibiotic-phage Treatments on Lysogenic and Nonlysogenic Bacteria Dynamics, Mathematical Methods in the Applied Sciences 48 (2025), 10550–10570.
  10. Sylla, A., Chevillon, C., Djidjou-Demasse, R., Seydi, O., Campos, C.A.V., Dogbe, M., Guégan, J.F., Understanding the transmission of bacterial agents of sapronotic diseases using an ecosystem-based approach: A first spatially realistic metacommunity model, PLOS Computational Biology 20(9) (2024), e1012435.
  11. Agusto, F. B., Djidjou-Demasse, R., Seydi, O., Mathematical model of Ehrlichia chaffeensis transmission dynamics in dogs, Journal of Biological Dynamics 17(1) (2023). DOI
  12. Mann-Manyombe, M. L., Mendy, A., Seydi, O., Linking within- and between-host scales for understanding the evolutionary dynamics of quantitative antimicrobial resistance, Journal of Mathematical Biology 87 (2023). DOI
  13. Djidjou-Demasse, R., Goudiaby, I., Seydi, O., Growth bound and threshold dynamic for nonautonomous nondensely defined evolution problems, Journal of Mathematical Biology 87 (2023). DOI
  14. Djidjou-Demasse, R., Mann-Manyombe, M. L., Seydi, O., Yatat-Djeumen, V., Differential preferences for RBCs is key for Plasmodium species evolutionary diversity within human host, Studies in Applied Mathematics 149(4) (2022). DOI
  15. Magal, P., Seydi, O., Webb, G. F., Wu, Y., A Model of Vaccination for Dengue in the Philippines 2016–2018, Frontiers in Applied Mathematics and Statistics (2021).
  16. Mbaye, I., Seydi, O., Sonko, A., On Multilayer Reaction-Diffusion problems: a Semigroup Approach, part I, Quaestiones Mathematicae (2021). DOI
  17. Magal, P., Seydi, O., Wang, F. B., Positively Invariant Subset for Non-Densely Defined Cauchy Problems, Journal of Mathematical Analysis and Applications 494 (2020). DOI
  18. Magal, P., Seydi, O., Variation of constants formula and exponential dichotomy for non autonomous non densely defined Cauchy problems, Canadian Journal of Mathematics 73(5) (2021), 1347–1389. DOI
  19. Griette, Q., Magal, P., Seydi, O., Unreported cases for age dependent COVID-19 outbreak in Japan, Biology 9, 132 (2020). DOI
  20. Liu, Z., Magal, P., Seydi, O., Webb, G. F., A COVID-19 epidemic model with latency period, Infectious Disease Modelling 5 (2020), 323–337. DOI
  21. Liu, Z., Magal, P., Seydi, O., Webb, G. F., Predicting the cumulative number of cases for the COVID-19 in China from early data, Mathematical Biosciences and Engineering 17(4) (2020), 3040–3051. DOI
  22. Liu, Z., Magal, P., Seydi, O., Webb, G. F., Understanding Unreported Cases in the COVID-19 Epidemic Outbreak in Wuhan, China, Biology 9, 50 (2020). DOI
  23. Magal, P., Seydi, O., Wang, F. B., Monotone abstract non-densely defined Cauchy problems applied to age structured population dynamic models, Journal of Mathematical Analysis and Applications 479(1) (2019), 450–481. DOI
  24. Diagne, M. L., Seydi, O., Sy, A. A. B., A two-group age of infection epidemic model with periodic behavioral changes, DCDS-B 25(6) (2019), 2057–2092. DOI
  25. Magal, P., Seydi, O., Persistence of normally hyperbolic manifolds for a system of non densely defined Cauchy problems, Journal of Differential Equations 267(5) (2019), 2950–3008. DOI
  26. Magal, P., Seydi, O., Webb, G. F., Final size of a multi-group SIR epidemic model, Mathematical Biosciences 301 (2018), 59–67. DOI
  27. Ducrot, A., Magal, P., Seydi, O., Singular perturbation for an abstract non-densely defined Cauchy problem, Journal of Evolution Equations 17(3) (2016), 1089–1128. DOI
  28. Magal, P., Seydi, O., Webb, G. F., Final size of an epidemic for a two-group SIR model, SIAM Journal on Applied Mathematics 76(5) (2016), 2042–2059. DOI
  29. Webb, G. F. et al., Seydi, O., A Model of 2014 Epidemic in West Africa With Contact Tracing, PLOS Currents Outbreaks (2015).
  30. Ducrot, A., Magal, P., Seydi, O., A finite time condition for exponential trichotomy in infinite dynamical systems, Canadian Journal of Mathematics 67(5) (2014), 1065–1090. DOI
  31. Ducrot, A., Magal, P., Seydi, O., Persistence of exponential trichotomy for linear operators, Journal of Dynamics and Differential Equations 28 (2016), 93–126. DOI
  32. Ducrot, A., Magal, P., Seydi, O., A singularly perturbed Delay Differential Equation modeling nosocomial infections, Differential and Integral Equations 29(3-4) (2016), 321–358.
  33. Ducrot, A., Magal, P., Seydi, O., Nonlinear boundary conditions derived by singular perturbation in age structured population dynamics model, Journal of Applied Analysis and Computation 1 (2011), 373–395.

Teaching

Functional Analysis (M1), Bifurcation Theory (M2), Differential Equations, Mathematical Modeling in Life Sciences (M2).

Contact

Email: