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  2. List of small groups - Wikipedia

    en.wikipedia.org/wiki/List_of_small_groups

    List of all nonabelian groups up to order 31 Order Id. [a] G o i Group Non-trivial proper subgroups [1] Cycle graph Properties 6 7 G 6 1: D 6 = S 3 = Z 3 ⋊ Z 2: Z 3, Z 2 (3) : Dihedral group, Dih 3, the smallest non-abelian group, symmetric group, smallest Frobenius group.

  3. Z-group - Wikipedia

    en.wikipedia.org/wiki/Z-group

    Usage: (Robinson 1996), (Kurosh 1960)The definition of central series used for Z-group is somewhat technical. A series of G is a collection S of subgroups of G, linearly ordered by inclusion, such that for every g in G, the subgroups A g = ∩ { N in S : g in N} and B g = ∪ { N in S : g not in N} are both in S.

  4. Lattice of subgroups - Wikipedia

    en.wikipedia.org/wiki/Lattice_of_subgroups

    Five of the eight group elements generate subgroups of order two, and the other two non-identity elements both generate the same cyclic subgroup of order four. In addition, there are two subgroups of the form Z 2 × Z 2, generated by pairs of order-two elements. The lattice formed by these ten subgroups is shown in the illustration.

  5. Subgroup - Wikipedia

    en.wikipedia.org/wiki/Subgroup

    This group has two nontrivial subgroups: J = {0, 4} and H = {0, 4, 2, 6} , where J is also a subgroup of H. The Cayley table for H is the top-left quadrant of the Cayley table for G; The Cayley table for J is the top-left quadrant of the Cayley table for H. The group G is cyclic, and so are its subgroups. In general, subgroups of cyclic groups ...

  6. Modular group - Wikipedia

    en.wikipedia.org/wiki/Modular_group

    It is easy to show that the trace of a matrix representing an element of Γ(N) cannot be −1, 0, or 1, so these subgroups are torsion-free groups. (There are other torsion-free subgroups.) The principal congruence subgroup of level 2, Γ(2), is also called the modular group Λ. Since PSL(2, Z/2Z) is isomorphic to S 3, Λ is a subgroup of index 6.

  7. Kurosh subgroup theorem - Wikipedia

    en.wikipedia.org/wiki/Kurosh_subgroup_theorem

    The vertex groups of Z are subgroups of G-stabilizers of vertices of X, that is, they are conjugate in G to subgroups of A and B. The edge groups of Z are trivial since the G-stabilizers of edges of X were trivial. By the fundamental theorem of Bass–Serre theory, H is canonically isomorphic to the fundamental group of the graph of groups Z.

  8. World War Z 2: Everything you need to know, including the ...

    www.aol.com/news/world-war-z-2-everything...

    World War Z may have come out nearly a decade ago, but fans of the zombie apocalypse film have been hankering for a sequel ever since. Unfortunately for them, however, it seems like the wait is ...

  9. Perfect group - Wikipedia

    en.wikipedia.org/wiki/Perfect_group

    By the three subgroups lemma (or equivalently, by the Hall-Witt identity), it follows that [G, Z 2] = [[G, G], Z 2] = [G, G, Z 2] = {1}. Therefore, Z 2Z 1 = Z(G), and the center of the quotient group G / Z(G) is the trivial group. As a consequence, all higher centers (that is, higher terms in the upper central series) of a perfect group ...

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