Editing Path integral formulation (section)

== Path integral in quantum-mechanical interpretation ==

In one [[interpretation of quantum mechanics]], the "sum over histories" interpretation, the path integral is taken to be fundamental, and reality is viewed as a single indistinguishable "class" of paths that all share the same events.<ref>{{Cite web |last=Pössel |first=Markus |title=The sum over all possibilities: The path integral formulation of quantum theory |website=Einstein Online |url=https://www.einstein-online.info/en/spotlight/path_integrals/ |access-date=2021-07-16 |date=2006 |id=02-1020}}</ref> For this interpretation, it is crucial to understand what exactly an event is. The sum-over-histories method gives identical results to canonical quantum mechanics, and Sinha and Sorkin<ref>{{harvnb|Sinha|Sorkin|1991}}</ref> claim the interpretation explains the [[Einstein–Podolsky–Rosen paradox]] without resorting to [[action at a distance|nonlocality]].

Some{{who|date=August 2014}} advocates of interpretations of quantum mechanics emphasizing [[decoherence]] have attempted to make more rigorous the notion of extracting a classical-like "coarse-grained" history from the space of all possible histories.