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And there are as many parts of philosophy as there are kinds of
substance, so that there must necessarily be among them a first
philosophy and one which follows this. For being falls immediately
into genera; for which reason the sciences too will correspond to
these genera. For the philosopher is like the mathematician, as that
word is used; for mathematics also has parts, and there is a first and
a second science and other successive ones within the sphere of
mathematics.
Now since it is the work of one science to investigate
opposites, and plurality is opposed to unity-and it belongs to one
science to investigate the negation and the privation because in
both cases we are really investigating the one thing of which the
negation or the privation is a negation or privation (for we either
say simply that that thing is not present, or that it is not present
in some particular class; in the latter case difference is present
over and above what is implied in negation; for negation means just
the absence of the thing in question, while in privation there is also
employed an underlying nature of which the privation is
asserted):-in view of all these facts, the contraries of the
concepts we named above, the other and the dissimilar and the unequal,
and everything else which is derived either from these or from
plurality and unity, must fall within the province of the science
above named
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