Text this: Positivity and stability analysis for linear implicit difference delay equations

  _____    _    _     _____      ___     _____    
 / ____|| | || | ||  /  ___||   / _ \\  |  __ \\  
/ //---`' | || | || | // __    | / \ || | |  \ || 
\ \\___   | \\_/ || | \\_\ ||  | \_/ || | |__/ || 
 \_____||  \____//   \____//    \___//  |_____//  
  `----`    `---`     `---`     `---`    -----`