A Virus Propagation Model and Optimal Control Strategy in the Point-to-Group Network to Information Security Investment

<div>Optimal control function for system (<a href="https://static.hindawi.com/articles/complexity/volume-2021/6612451/figures/#EEq16">16</a>).</div>

Complexity

Figure 4: A Virus Propagation Model and Optimal Control Strategy in the Point-to-Group Network to Information Security Investment 