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  2. Yahoo! Groups - Wikipedia

    en.wikipedia.org/wiki/Yahoo!_Groups

    Yahoo! Groups was a free-to-use system of electronic mailing lists offered by Yahoo! . Prior to February 2020, Yahoo! Groups was one of the world's largest collections of online discussion boards. It allowed members to subscribe to various groups, read subscribed discussions online, view and share photos, files and bookmarks within a group ...

  3. List of small groups - Wikipedia

    en.wikipedia.org/wiki/List_of_small_groups

    Order p 2: There are just two groups, both abelian. Order p 3: There are three abelian groups, and two non-abelian groups. One of the non-abelian groups is the semidirect product of a normal cyclic subgroup of order p 2 by a cyclic group of order p. The other is the quaternion group for p = 2 and a group of exponent p for p > 2.

  4. Free product - Wikipedia

    en.wikipedia.org/wiki/Free_product

    In mathematics, specifically group theory, the free product is an operation that takes two groups G and H and constructs a new group G ∗ H. The result contains both G and H as subgroups, is generated by the elements of these subgroups, and is the “universal” group having these properties, in the sense that any two homomorphisms from G and H into a group K factor uniquely through a ...

  5. Examples of groups - Wikipedia

    en.wikipedia.org/wiki/Examples_of_groups

    Permutations of a set of three elements. Group of translations of the plane. Symmetry group of a square: dihedral group of order 8. Generating the group. Normal subgroup. Free group on two generators. Set of maps. Sets of maps from a set to a group. Automorphism groups.

  6. Free group - Wikipedia

    en.wikipedia.org/wiki/Free_group

    The free group FS is defined to be the group of all reduced words in S, with concatenation of words (followed by reduction if necessary) as group operation. The identity is the empty word. A reduced word is called cyclically reduced if its first and last letter are not inverse to each other.

  7. Lists of mathematics topics - Wikipedia

    en.wikipedia.org/wiki/Lists_of_mathematics_topics

    Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions. German mathematician Carl Friedrich Gauss said, "Mathematics is the queen of the sciences—and number theory is the queen of mathematics." Number theory also studies the natural, or whole, numbers.

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