The logic of unboundedly reactive systems

Summary Scientific theories often need to envision that a given output variable Y is jointly determined by all input variables of a certain kind _X that we can identify onlyas a kind without knowing all its specific instances or even how many of these there are, When the number of variables in _X is possibly infinite, the function by which they determine Y proves to be enormously enigmatic, epistemically, mathematically, and scientifically.