Text this

Number:

Provider:

CAPTCHA:

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

Please enter what you see:

Text this: Linear Operators that Preserve the Edgesum of a Graph