Text this: Vanishing sums of mth roots of unity in finite fields

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