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

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