發送短信

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 _    _     ______    ____     _    _    ______   
| \  / ||  /_   _//  |  _ \\  | || | || |      \\ 
|  \/  ||   -| ||-   | |_| || | || | || |  --  // 
| .  . ||   _| ||_   | .  //  | \\_/ || |  --  \\ 
|_|\/|_||  /_____//  |_|\_\\   \____//  |______// 
`-`  `-`   `-----`   `-` --`    `---`   `------`

Please enter what you see:

發送短信 : Linear Operators that Preserve the Edgesum of a Graph