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

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Text this: Linear preservers on matrices