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a dedekind cut is a partition of the rational numbers into two non-empty sets a and b, such that all elements of a are less than all elements of b, and a contains no greatest element. the set b may or may not have a smallest element among the rationals. if b has a smallest element among the rationals, the cut corresponds to that rational.
julius wilhelm richard dedekind (6 october 1831 – 12 february 1916) was a german mathematician who made important contributions to abstract algebra (particularly ring theory), axiomatic foundation for the natural numbers, algebraic number theory and the definition of the real numbers
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