SOME REMARKS ON THE WIDE-PAST MARKOV PROPERTY IN THE PLANE

Ⅰ. INTRODUCTION AND DEFINITIONS When we consider different pasts, there are various definitions of Markov properties for twoparameter processes. Even if we only consider the wide-past, there are still several definitions of Markov properties, for example, the *-Markov property in [1], the wide-past Markov property in [2] and another wide-past Markov property given in [3] and the one