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

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發送短信 : Exact solution for buckling of columns including self-weight