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

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發送短信 : Factorisation of greedoid polynomials of rooted digraphs