Path-ordering
Procedure of ordering a product operators / From Wikipedia, the free encyclopedia
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This article is about rearranging a product of operators in physics. For the well-orderings on mathematical terms, see Path ordering (term rewriting).
In theoretical physics, path-ordering is the procedure (or a meta-operator ) that orders a product of operators according to the value of a chosen parameter:
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Here p is a permutation that orders the parameters by value:
For example: