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Aristotle - Metaphysics
Atec Февраль 16 2008 19:57:08
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While in a sense we call anything one if it is a quantity and
continuous, in a sense we do not unless it is a whole, i.e. unless
it has unity of form; e.g. if we saw the parts of a shoe put
together anyhow we should not call them one all the same (unless
because of their continuity); we do this only if they are put together
so as to be a shoe and to have already a certain single form. This
is why the circle is of all lines most truly one, because it is
whole and complete.
(3) The essence of what is one is to be some kind of beginning
of number; for the first measure is the beginning, since that by which
we first know each class is the first measure of the class; the one,
then, is the beginning of the knowable regarding each class. But the
one is not the same in all classes. For here it is a quarter-tone, and
there it is the vowel or the consonant; and there is another unit of
weight and another of movement. But everywhere the one is
indivisible either in quantity or in kind. Now that which is
indivisible in quantity is called a unit if it is not divisible in any
dimension and is without position, a point if it is not divisible in
any dimension and has position, a line if it is divisible in one
dimension, a plane if in two, a body if divisible in quantity in
all--i.e. in three--dimensions. And, reversing the order, that which
is divisible in two dimensions is a plane, that which is divisible
in one a line, that which is in no way divisible in quantity is a
point or a unit,-that which has not position a unit, that which has
position a point
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