發送短信 : Algebraic connections between topological indices

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