In classical economic theory, things could never have gotten this far.

Other observations began not to "fit" the picture of classical theory.

This is not possible in the classical theory as everything has equal and full membership.

Classical economic theory denies that those characteristics can be taken as given.

There are important factors in these scenarios that classical theory does not account for.

Classical humanist dramatic theory says a play should have action taking place during one entire day.

Classical theory, however, predicted that this structure should be unstable.

Note that in contrast to classical theory, more than two linked components may appear.

Classical theory had also failed to explain successfully two other experimental results that appeared in the late 19th century.

The war demonstrates "that classical military theory applies only to the countries in which it was made, those of the advanced Western world."