  Neutral pseudoscalar mesons in an entangled or Einstein-Podolsky-Rosen state
are routinely produced in phi and B factories. Based on the peculiar properties
of an entangled state, we present some general exact theorems about parameters
characterizing CP and CPT violations, by using various asymmetries defined for
the correlated decays of the two entangled mesons, which are rigorously
calculated.
