發送短信

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

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