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

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Text this: NUMERICAL RANGE OF LINEAR OPERATORS AND MATRICES