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Aristotle - Metaphysics
Atec Февраль 16 2008 19:57:08
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. But to change from one
genus to another genus is not possible except in an incidental way, as
from colour to figure. Intermediates, then, must be in the same
genus both as one another and as the things they stand between.
But (2) all intermediates stand between opposites of some kind;
for only between these can change take place in virtue of their own
nature (so that an intermediate is impossible between things which are
not opposite; for then there would be change which was not from one
opposite towards the other). Of opposites, contradictories admit of no
middle term; for this is what contradiction is-an opposition, one or
other side of which must attach to anything whatever, i.e. which has
no intermediate. Of other opposites, some are relative, others
privative, others contrary. Of relative terms, those which are not
contrary have no intermediate; the reason is that they are not in
the same genus. For what intermediate could there be between knowledge
and knowable? But between great and small there is one.
(3) If intermediates are in the same genus, as has been shown, and
stand between contraries, they must be composed of these contraries.
For either there will be a genus including the contraries or there
will be none. And if (a) there is to be a genus in such a way that
it is something prior to the contraries, the differentiae which
constituted the contrary species-of-a-genus will be contraries prior
to the species; for species are composed of the genus and the
differentiae
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