Palm calculus

In the study of stochastic processes, Palm calculus, named after Swedish teletrafficist Conny Palm, is the study of the relationship between probabilities conditioned on a specified event and time-average probabilities. A Palm probability or Palm expectation, often denoted ${\displaystyle P^{0}(\cdot )}$ or ${\displaystyle E^{0}[\cdot ]}$, is a probability or expectation conditioned on a specified event occurring at time 0.