Mathematics
Fractional Order
100%
Time Delay
87%
Delay-Differential Equation
56%
Stochastics
52%
Numerical Simulation
46%
Differential Model
46%
Mathematical Modeling
44%
Hopf Bifurcation
33%
Optimal Control Theory
24%
Biological System
22%
Asymptotic Stability
18%
Incidence Rate
16%
Optimal Control Problem
16%
Global Dynamics
16%
Differential Equation
15%
Sufficient Condition
14%
Deterministic Model
14%
Parameter Estimation
14%
Fractional Order Derivative
12%
Predator-Prey System
12%
Equilibrium Point
10%
Reproduction Number
10%
Numerical Solution
10%
Ordinary Differential Equation
10%
Numerical Methods
10%
Random Noise
9%
Stability Analysis
9%
Dynamical System
9%
Numerical Example
8%
Reaction-Diffusion System
8%
Genetic Regulatory Network
8%
Stochastic Differential Equation
8%
Control Function
8%
Complex Networks
8%
Partial Differential Equation
8%
Treatment Strategy
7%
Boundedness
7%
Positive Solution
6%
Life Cycle
6%
Experimental Data
6%
Susceptibles
6%
Endemic Equilibrium
6%
Discrete Time
6%
Finite Time
6%
Equilibrium Solution
6%
Integer
6%
Disease Dynamic
6%
Fractional Differential Equations
6%
Numerical Approach
6%
Fixed-Time Stability
5%
Periodic Solution
5%
Response Function
5%
Nonlinearities
5%
Initial Condition
5%
Direct Method
5%
Qualitative Behavior
5%
Dynamic Analysis
5%
Control Parameter
5%
Neural Network
5%
Keyphrases
Delay Differential Equations
28%
Delay Differential Model
12%
Optimal Control
10%
Fractional-order Model
10%
Fractional Order Delay
9%
Sensitivity Analysis
9%
Volterra Delay-integro-differential Equation
8%
Fractional Order
8%
Allee Effect
8%
COVID-19 Infection
7%
Intracellular Delay
7%
Parameter Estimation
7%
Bioscience
7%
Coronavirus COVID-19
6%
Hepatitis C Virus Replication
6%
Cellular Interactions
6%
Interaction Delay
6%
Neutral Delay Differential Equations
6%
System Memory
6%
Tumor Cells
6%
Tumor-immune Interaction
6%
Stability Analysis
5%
Numerical Simulation
5%
Immune System
5%
Predator-prey Interactions
5%
Coronavirus Infections
5%
Lyapunov Function
5%
Effector Cells
5%
Least Squares Approach
5%
Real Observations
5%
Tumor-immune System
5%
Mathematical Model
5%
Cell Division
5%
