That is, a system starts with a group of interrelated propositions which involve reference to empirical observations within the logical framework of the propositions in question.
But the scientific importance of a change in knowledge of fact consists precisely in j its having consequences for a system of theory.
Among those who are satisfactory in this respect it is desirable to have represented as great a diversity of intellectual tradition, social milieu and personal character as possible.
If there are four equations and only three variables, and no one of the equations is derivable from the others by algebraic manipulation then there is another variable missing.
The conception that, instead of this, contemporary society is at or near a turning point is very prominent in the views of a school of social scientists who, though they are still comparatively few, are getting more and more of a hearing.