أرسل هذا في رسالة قصيرة: Exact solution for buckling of columns including self-weight

  ____       ___     _    _     ______    ______  
 |  _ \\    / _ \\  | || | ||  /_   _//  /_   _// 
 | |_| ||  | / \ || | || | ||   -| ||-   `-| |,-  
 | .  //   | \_/ || | \\_/ ||   _| ||_     | ||   
 |_|\_\\    \___//   \____//   /_____//    |_||   
 `-` --`    `---`     `---`    `-----`     `-`'