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

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Text this: An exact formulation of the time-ordered exponential using path-sums