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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