(Introduction to the Dialectic/Concepts of Pure Reason) Consider a
hypothetical syllogism of the form:
If all C is D, then all A is B.
But, all C is D.
Therefore, all A is B.
Explain the difference between (1) the unity of the understanding which
allows the concept A to be brought under the concept B and (2) the
unity of reason which allows the judgment All A is B to be explained by
the principle, If all C is D, then all A is B. In particular: explain how
both (1) and (2) involve the unification of the same manifold of possible
cognitions, namely, those falling under the concept A. The purpose of the
unification (1) is to “collect much possible knowledge into one” — that
is, in this case, to allow the predicate concept, B, to be applied at once
to every object of the subject concept, A. So the possible objects of A
are to be united in virtue of their common conformity to the concept A,
and for the purpose of representing them all together as object to B. In
virtue of what, and for what purpose, are the objects of A to be united in
(2)?