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    Subgroup

    Basic definition

    A subgroup is a subset of a mathematical group that is also a group.

    Detailed definition

    A subgroup is a subset H of group elements of a group G that satisfies the four group requirements. It must therefore contain the identity element. "H is a subgroup of G" is written H⊆G, or sometimes H<=G.
The order of any subgroup of a group of order h must be a divisor of h.
A subgroup H of a group G that does not include the entire group G itself is known as a proper subgroup, denoted H subset G or H<G.

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