發送短信 : Algebraic connections between topological indices

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