Rational numbers

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A rational number is a number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q. The set of all rational numbers, also referred to as "the rationals", the field of rationals, or the field of rational numbers is usually denoted by a boldface Q (or blackboard bold , Unicode U+1D410 𝐐 MATHEMATICAL BOLD CAPITAL Q, or U+211A DOUBLE-STRUCK CAPITAL Q).[1]

The rational numbers () are included in the real numbers (), while themselves including the integers (), which in turn include the natural numbers ()

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