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

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發送短信 : Differential Equations, Chaos and Variational Problems