أرسل هذا في رسالة قصيرة: Stability analysis of epidemic model with varrying total population size and constant immigration rate

  _  __   _    _    _    _      ___              
 | |/ // | || | || | || | ||   / _ \\    ____    
 | ' //  | || | || | || | ||  | / \ ||  |    \\  
 | . \\  | \\_/ || | \\_/ ||  | \_/ ||  | [] ||  
 |_|\_\\  \____//   \____//    \___//   |  __//  
 `-` --`   `---`     `---`     `---`    |_|`-`   
                                        `-`