Editing Ordered exponential (section)

{{Short description|Generalisation of the exponential integral to non-commutative algebras}}
{{More citations needed|date=April 2018}}
The '''ordered exponential''', also called the '''path-ordered exponential''', is a [[mathematics|mathematical]] operation defined in [[non-commutative]] [[algebra over a field|algebras]], equivalent to the [[exponential function|exponential]] of the [[integral]] in the [[commutative]] algebras.  In practice the ordered exponential is used in [[matrix (mathematics)|matrix]] and [[operator (mathematics)|operator]] algebras.  It is a kind of [[product integral]], or Volterra integral.