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The general n-point information (n-pi) are introduced and equations for themare considered. The role of right and left invertible interaction operatorsoccurring in these equations together with their interpretation is discussed.Some comments on approximations to the proposed equations are given. Theimportance of positivity conditions and a possible interpretation of n-pi inthe case of their non-compliance, for essentially non-linear interactions(ENI), are proposed. A language of creation, annihilation and projectionoperators which can be applied in classical as well as in quantum case is used.The role of the complex numbers and functions in physics is also a littleelucidated.

Equations for generalized n-point information with extreme and not extreme approximations in the free Fock space