  A description of electromagnetism as four-dimensional spacetime structure
leads to the dynamics of a charged particle being determined only by the
four-vector potential and the existence of an electromagnetic field depending
on the topological structure of the background spacetime. When the spacetime
structure of electromagnetism is complex it is possible to connect spacetime
structure and quantum physics via the method of path integration. (This paper
is a consequence of an attempt to incorporate gravitation into electromagnetism
by describing gravity as a coupling of two electromagnetic fields.)
