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  2. Cyclic number - Wikipedia

    en.wikipedia.org/wiki/Cyclic_number

    For example, the case b = 10, p = 7 gives the cyclic number 142857, and the case b = 12, p = 5 gives the cyclic number 2497. Not all values of p will yield a cyclic number using this formula; for example, the case b = 10, p = 13 gives 076923076923, and the case b = 12, p = 19 gives 076B45076B45076B45. These failed cases will always contain a ...

  3. Cyclic group - Wikipedia

    en.wikipedia.org/wiki/Cyclic_group

    A cyclic group is a group which is equal to one of its cyclic subgroups: G = g for some element g, called a generator of G. For a finite cyclic group G of order n we have G = {e, g, g2, ... , gn−1}, where e is the identity element and gi = gj whenever i ≡ j (mod n); in particular gn = g0 = e, and g−1 = gn−1.

  4. Cyclic permutation - Wikipedia

    en.wikipedia.org/wiki/Cyclic_permutation

    In mathematics, and in particular in group theory, a cyclic permutation is a permutation consisting of a single cycle. [1][2] In some cases, cyclic permutations are referred to as cycles; [3] if a cyclic permutation has k elements, it may be called a k-cycle. Some authors widen this definition to include permutations with fixed points in ...

  5. Cyclic number (group theory) - Wikipedia

    en.wikipedia.org/wiki/Cyclic_number_(group_theory)

    A cyclic number [1] [2] is a natural number n such that n and φ(n) are coprime. Here φ is Euler's totient function. An equivalent definition is that a number n is cyclic if and only if any group of order n is cyclic. [3] Any prime number is clearly cyclic. All cyclic numbers are square-free. [4] Let n = p 1 p 2 …

  6. Cyclic compound - Wikipedia

    en.wikipedia.org/wiki/Cyclic_compound

    A cyclic compound (or ring compound) is a term for a compound in the field of chemistry in which one or more series of atoms in the compound is connected to form a ring. Rings may vary in size from three to many atoms, and include examples where all the atoms are carbon (i.e., are carbocycles), none of the atoms are carbon (inorganic cyclic ...

  7. Hückel's rule - Wikipedia

    en.wikipedia.org/wiki/Hückel's_rule

    Hückel's rule. Benzene, the most widely recognized aromatic compound with six delocalized π-electrons (4 n + 2, for n = 1). In organic chemistry, Hückel's rule predicts that a planar ring molecule will have aromatic properties if it has 4 n + 2 π-electrons, where n is a non-negative integer. The quantum mechanical basis for its formulation ...

  8. Repeating decimal - Wikipedia

    en.wikipedia.org/wiki/Repeating_decimal

    For example ⁠ 1 / 7 ⁠ starts '142' and is followed by '857' while ⁠ 6 / 7 ⁠ (by rotation) starts '857' followed by its nines' complement '142'. The rotation of the repetend of a cyclic number always happens in such a way that each successive repetend is a bigger number than the previous one.

  9. 142857 - Wikipedia

    en.wikipedia.org/wiki/142857

    The 142857 number sequence is also found in several decimals in which the denominator has a factor of 7. In the examples below, the numerators are all 1, however there are instances where it does not have to be, such as ⁠ 2 / 7 ⁠ (0. 285714). For example, consider the fractions and equivalent decimal values listed below: ⁠ 1 / 7 ⁠ = 0 ...