Özet:
In a pair of mixed advanced-retarded differential equations we consider man as being the
master system and the environment as the slave system. This is the case when man’s behaviour is
dependent on a future state of the environment, while the environment’s rate of change is dependent on
a past state (hence a past action) of man. Man, as the master system, should take forecasts into
consideration. The mathematical model used in the paper pertains to the modelling of interaction of two
systems, such as the observation operator, the pragmatic operator, and especially the differential system
of equations, in case the reciprocal influence between two systems manifests itself, throughout their
evolution, with a time difference.
