TY - CPAPER AB - An analysis of classical mechanics in a complex extension of phase space shows thata particle in such a space can behave in a way redolant of quantum mechanics; addi-tional degrees of freedom permit 'tunnelling' without recourse to instantons and lead totime/energy uncertainty. In practice, 'classical' particle trajectories with additional de-grees of freedom have arisen in several di®erent formulations of quantum mechanics. Inthis talk we compare the extended phase space of the closed time-path formalism withthat of complex classical mechanics, to suggest that ~ has a role in our understanding ofthe latter. However, di®erences in the way that trajectories are used make a deeper com-parison problematical. We conclude with some thoughts on quantisation as dimensionalreduction. AU - Rivers,RJ EP - 89 PY - 2011/// SP - 83 TI - Path Integrals for (Complex) Classical andQuantum Mechanics ER -