High Quality Content by WIKIPEDIA articles! In mathematics, and in particular in group theory, a cycle is a permutation of the elements of some set X which maps the elements of some subset S to each other in a cyclic fashion, while fixing (i.e., mapping to themselves) all other elements. The set S is called the orbit of the cycle.One of the basic results on symmetric groups says that any permutation can be expressed as product of disjoint cycles (more precisely: cycles with disjoint orbits); such cycles commute with each other, and the expression of the permutation is unique up to the order of the cycles (but note that the cycle notation is not unique: each k-cycle can itself be written in k different ways, depending on the choice of s0 in its orbit).

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