What derives from abstraction; what is not
Note that what is abstract in
this sense tend to be ideas,
imaginations, whether or not - like
mathematics or metaphysics or
ethics - these abstract ideas are deemed to be
applicable to empirically given reality.
One important limitation and danger of
abstract things - which is also the reason for its strengths - is that they
derive from disregarding certain aspects of real things.
things that are disregarded are normally supposed
to be irrelevant to the truth or falsity of the
judgment that so-and-so is or satisfies an abstraction of a certain kind.
One important class of abstractions are natural
kinds, which shows that what may be derived by
abstraction - disregarding all features and all
individual distinctions that are irrelevant
to whether or not something is, say, a lion - still may be quite
real and practically useful (if true).