أرسل هذا في رسالة قصيرة: A priori error estimates for finite volume element approximations to second order linear hyperbolic integro-differential equations

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