for
in its time domain, assuming these covariances
exist. Here, denotes the number of points
in the interval,
and
denotes covariance (Schoenberg 2011). Intuitively,
the occurrence of past points inhibits the occurrence of
future points.
Schoenberg, F. P. "Introduction to Point Processes." In Wiley Encyclopedia of Operations Research and Management Science. New York:
Wiley, 2011. https://doi.org/10.1002/9780470400531.eorms0425.