If it be assumed that division
(except by zero) and subtraction
are always possible, the
system of positive integers then leads to a system of rational numbers.
A rational number (expressible as a ratio of integers) remains a rational number when
expressed in any integral base, and any rational number can be represented by a terminating
or repeating basimal (decimal in base 10).
Rational numbers have the form p/q, in which p and q are integers with q
not equal to zero.
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