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

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Text this: Boltzmann equation, boundary effects