أرسل هذا في رسالة قصيرة: Cauchy’s Functional Equation, Schur’s Lemma, One-Dimensional Special Relativity, and Möbius’s Functional Equation

             ___     ______    _    _             
  ____      / _ \\  |      \\ | || | ||   ____    
 |    \\   / //\ \\ |  --  // | || | ||  |    \\  
 | [] ||  |  ___  |||  --  \\ | \\_/ ||  | [] ||  
 |  __//  |_||  |_|||______//  \____//   |  __//  
 |_|`-`   `-`   `-` `------`    `---`    |_|`-`   
 `-`                                     `-`